{
  "manageEntity": {
    "action": "Save",
    "entityId": "239415094",
    "entityType": "Track",
    "nonce": "0xc27630e8af284a8e237659ad7a4710d85fe5315ac29e305a62d79a025f3a48ba",
    "signature": "0x74a9632f8ae2c82688048b2e16784f6c789b598cc0726b44570b7a5820b7ab3b47137a2ed77b53f9605c2e537d999315f040ad91d4be4c9232e0c6e0d1aa37f81c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}