{
  "manageEntity": {
    "action": "Save",
    "entityId": "493142",
    "entityType": "Track",
    "nonce": "0xb68bf99b7e0b86e49c6840dba8abdb6a27f5c172d378809508b6efecb9b307f6",
    "signature": "0x4ef715153b012146b470dc70a3d81d0e8413e182988452a76e3fe377eaf4d88405abf39a94c6594ec439b5a0d79657b1ed66b7d23e82ea21ea264e6795bae9531c",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}