{
  "manageEntity": {
    "action": "Save",
    "entityId": "1866042672",
    "entityType": "Track",
    "nonce": "0x243ca8c6e913bf746d96e63482bee3be728bdba829f7b4f9bf56099f46ad1aa3",
    "signature": "0x72206c53da99d8e706f45067499b97a47eec2e43603b9f6f43252a82e998b72f620d30103435286195c9d1001e06f0c78ee38e9733a8a1f1caf1b12b4e06fc321c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}