{
  "manageEntity": {
    "action": "Save",
    "entityId": "189701",
    "entityType": "Track",
    "nonce": "0xf390cfb9c9cb60345360ee2e77c6d26f85c157238bf7a85bd3261ec3ffde4bcb",
    "signature": "0xed0deda567694f47ce71c001cc4c68f17d47c6e0bdc89812c49966bbb3a926bc192b84047bc87b3d4b56fd88c56c039df572208b288c5a03d6f2e2b49c63aa391c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}