{
  "manageEntity": {
    "action": "Save",
    "entityId": "640045838",
    "entityType": "Track",
    "nonce": "0x8939abfe3db92457b66fc5db5297bb113d5e0455ce04f0dac3951e2993fc8acd",
    "signature": "0xb0ecc37df5d646c7b3057214acaff223c6872c0f8d398a116b2d0106b40a7ba57e0b36f29d75b4dc26c04b57b127555e9f161fa696e81e4376325e4d97ef07141c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}