{
  "manageEntity": {
    "action": "Save",
    "entityId": "845766247",
    "entityType": "Track",
    "nonce": "0x1209a24bd3f9d98d84e7eb77ee9a78acb006c4f608b63c23b09155c443a7e6c5",
    "signature": "0x2993acb54ea033dbed9d5e377972d92b6af9ec0c99d18110ba9a63f6d1e0528047a8c8fca2c31b13de5700a00703ff2c536ffb34f0083379fdce8bcd1071b9a81c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}