{
  "manageEntity": {
    "action": "Save",
    "entityId": "787036120",
    "entityType": "Track",
    "nonce": "0xf04cdc33b3874554cdbe14fe90b0e9667ffbc113868d8c32b67475817efcea48",
    "signature": "0x385d356fc974bba43f65dea326887d3d331fbb941edc5b7c8194b9bf22cc22454afa4f3f607d2eb7c5494e1acacf843f2e05530ae9c023adde3413aae87cf4411b",
    "signer": "0xc397C4709687C73dfCC135CDC077A82066147CFA",
    "userId": "552759720"
  }
}