{
  "manageEntity": {
    "action": "Save",
    "entityId": "640804772",
    "entityType": "Track",
    "nonce": "0x5f41af41677142776d08b5f19772c544521ec9a0e9aa10f1245e8e21f88430db",
    "signature": "0x68008ad98d290eecbb500f3c62782f5e7aacacfe42deedeb0b30c02bca61abbf4c6744071d43b1ab77262a7a0bc955ac2592ff01809c04a958211e995d8653511b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}