{
  "manageEntity": {
    "action": "Save",
    "entityId": "395624170",
    "entityType": "Track",
    "nonce": "0x340b28d08e282f1a0ea17fed08619d19847f5e28a7550b65f0102b9ddd8b03b3",
    "signature": "0xd55cd29dec7e0e2ca9f5920c58d9859984ef15d4b207a0b5751bd0888820b3907fd36892ac99352a98301fd6f28824bb31d996b5e6ce43504530e0436578d86f1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}