{
  "manageEntity": {
    "action": "Save",
    "entityId": "548947448",
    "entityType": "Track",
    "nonce": "0xdd301747246edee944104ee59d8b04a08967fa2f176544042512292fe8ab5971",
    "signature": "0x66bd3319957206d5067571783d66d79f570e2c3d2f4cece3a1e38dedc7dfb2ad086b60c410c8b99869dc928952f4b244b92e29de14ef9d55d2f5791931c2582a1b",
    "signer": "0x8a278E79c8E7e655B94c3e6798972A44Daa2c6ad",
    "userId": "24098924"
  }
}