{
  "manageEntity": {
    "action": "Save",
    "entityId": "974313127",
    "entityType": "Track",
    "nonce": "0xeea42eb3cd690b2d6e1f8fddee2487dc3f14ce2d0966657208565111239b0d5c",
    "signature": "0x509ad285698b9a1d9727403102e9728db14d89a4152d5aae015fb62dcb1444cc3adfee47b8044f1d1bf4866fcded347eb8a290ae27f762edb7aeb98271da22ba1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}