{
  "manageEntity": {
    "action": "Save",
    "entityId": "821838933",
    "entityType": "Track",
    "nonce": "0xc04b4c482161599ffa1520323314fbcc4666cb521dac35e90916d7e1d6a2282c",
    "signature": "0xe8f8f15b99cc9141129a9e1b6a4ea530c4af62e8b6925695953fceea8de1eefc65f0f020723a84d0367d0e523a2eb9a0d681c8cdcdbb0688ea51baf23c6a4ec91b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}