{
  "manageEntity": {
    "action": "Save",
    "entityId": "446221",
    "entityType": "Track",
    "nonce": "0xe118fb7dd56b194c600d089e07d004a66294438809e5d3f2ed38d22407cdf94a",
    "signature": "0x0583535068e93563571628cae75854ce64fe8274fc8a1ea8ce66c9866ad5254165dfbae326b8cc3b2ed294db795771f9b29d0c5ee92b265404dd42c090a536241b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}