{
  "manageEntity": {
    "action": "Save",
    "entityId": "222461",
    "entityType": "Track",
    "nonce": "0xb4e16730e742ed03ae5607db2b49856c7ab2e4de300cd31fd02454bc36c7f692",
    "signature": "0x1b02a966fa5a453a617012bbaf53320bb9575a3a33db00d08afd019db0a842c1548efc8bf1c11c842af4ff0b3b922f4f30e0219bae656c6633d091865b7c4c691b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}