{
  "manageEntity": {
    "action": "Save",
    "entityId": "439389263",
    "entityType": "Track",
    "nonce": "0xc276adbd53c978e755c612e548d87c8cf08a97e4ad6aa52d48f8ad1bbdd36bab",
    "signature": "0xf0c5db165d729e13ee03cc778da5ec3c0c4c2277fc3fcef1822e20e60fbc9f822483070120da18bbdc01d87cd1dbd0d0788312be670d007b4e3c17fbf6b7ac0e1c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}