{
  "manageEntity": {
    "action": "Save",
    "entityId": "489516877",
    "entityType": "Track",
    "nonce": "0xc31e769278b2eda2787907bbb86fd61dcfbc477eae8652de76cfbb18b1766ad8",
    "signature": "0x173575bf033676ff23c1c8580dc4e0e8847c3230d99108fe5687db7bd87cae566f8ff1f3dd37a7450246425c09c7ebfed06a11d95d723aa2dadbffd17382a2111b",
    "signer": "0x5501467AFaA7897fBBD65dE583c7E74577B92f74",
    "userId": "608591950"
  }
}