{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638251318",
    "entityType": "Track",
    "nonce": "0x7d1eb34f532dbb1a5c4306b025bd1709c1f46e655fb0b9a0a4a297e5beef2810",
    "signature": "0xb069de911ad5d3c8fb43ee5f805a7ced1934fb34cd4195bf6b1d1bce1036ca755df42ebf2859eaee3be4b42d0cf9dd370696a1bf63754bcd97699ce71caae5b71c",
    "signer": "0x90CBf7c9BBF688fd9Fa4029B96e1BC32b270cA24",
    "userId": "711459379"
  }
}