{
  "manageEntity": {
    "action": "Save",
    "entityId": "1477704176",
    "entityType": "Track",
    "nonce": "0x5e8e2e6c9baf0261b5ad0d5fc4cc87e327f6ea21b4176a2edd85548cb59fdea8",
    "signature": "0xe9da756fbb14d09535ec60db2aeb75852fd8cdc6e996c37fdc6c90df98cbeeb27f44f366725b2587f930d631d01f9e01df1a4b304560ac2303cd8476b0821da61c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}