{
  "manageEntity": {
    "action": "Save",
    "entityId": "769839",
    "entityType": "Track",
    "nonce": "0x3901615fdede12111aa1f31a91467d4eb101f42bb0de633516bf64852fe68ce8",
    "signature": "0xe997eed484b3aafef0fe0a9aff3a433025c3cd4ad835fffe7e94219c548dd07b7ad8eba2dd5174f6757e7e7bccd36665b4402c803d12db60c721caa21ba21cbb1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}