{
  "manageEntity": {
    "action": "Save",
    "entityId": "819183130",
    "entityType": "Track",
    "nonce": "1792447377245728813",
    "signature": "0xa8480a280243b8ecddeeb8ddfbe9f11e1171ad67b29af85b407e4bef44b5584776a0e4d50986f3f6a6adf00ed2005de1c77f2ca2f79285bdbfcaa399b1e450a91b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}