{
  "manageEntity": {
    "action": "Save",
    "entityId": "821816393",
    "entityType": "Track",
    "nonce": "0x123fb2f2f3137ecd96feaec774bdcea4066d901262faa196b30cc3e8d6d1c197",
    "signature": "0x8cdee8248aa0a31fd4ab307a355d9f134d4044bac362c044c87a72ac9a380b1d40371795cb15f7368d40cd0047118aa89e6f4aad8c0413c8576429bada4d55a21c",
    "signer": "0xF08935327AeC6306C8d0eb92999567e5496848C9",
    "userId": "989073793"
  }
}