{
  "manageEntity": {
    "action": "Save",
    "entityId": "950276646",
    "entityType": "Track",
    "nonce": "0x914b283c86e3186e2a8837a1c4aa22acad1390729dc4beb7a223dc83f0cb914c",
    "signature": "0x915b874320e352185e4c742bf906727d0091a905b872d652501f8b9691a2f9a94097a05b7a36f18a36d489cdb32f1b4ce4422d60b7c08ccc8d7aad061202ee511c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}