{
  "manageEntity": {
    "action": "Save",
    "entityId": "578651",
    "entityType": "Track",
    "nonce": "0xfaf3c123c6784aedd54e20f0e3f99346d1f65428f53e3a4b9197fef119843f5b",
    "signature": "0x38864a1f344781bffa6f0d43b705cf39d5a302852f5f5d4eb0fe128a0e785e472f31476923d885e3021b941a681d2be019fdc1ee1d6926660b2b31ee5c3906701b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}