{
  "manageEntity": {
    "action": "Save",
    "entityId": "477478",
    "entityType": "Track",
    "nonce": "0x6326c9762fc0722eaa8b4a4a7b59c8b94e1742a8f291e7d7ddb1b48254d2f503",
    "signature": "0xecc7d51ef39971181a397b388df4417c9f1c3ea1018a969660ed2ba7567ee486389eba277c7dbc36ca4c5459827fed20fd93d78bcce71ed34757409ead02055d1b",
    "signer": "0x372795a4826002437a98e0197Be89959E310F123",
    "userId": "515840650"
  }
}