{
  "manageEntity": {
    "action": "Save",
    "entityId": "949823487",
    "entityType": "Track",
    "nonce": "0x46a8e995c5baa728c9e2b485c036f33330a9be8905ba58f07953afa9d639cc99",
    "signature": "0xb6cd394f2575fbd9b4d4f99c88bcd398fea7f77b8f4d4d79a6fd4e6590b9afb255decc5d0ec417f646556f90b5cccf911210d9add2587cc4c79ad13afed4e2c91c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}