{
  "manageEntity": {
    "action": "Save",
    "entityId": "788351014",
    "entityType": "Track",
    "nonce": "0x5223589c62d6cd41fa0f21d4324579036850c1591405b2182d49ee6993929b14",
    "signature": "0x3c627491722efe89a4539b7b6451caf796e037c12d8b7f41890c3baf26d606932605437cf82fd91b5b35a5983f662d5bee5d24328ab051da06fed8e19a2b7fce1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}