{
  "manageEntity": {
    "action": "Save",
    "entityId": "1975903228",
    "entityType": "Track",
    "nonce": "0xa53df13dbcb23e4520d2a6abccd3e8041f4c044f2202ab49f4f657714f468d13",
    "signature": "0x888461a8b3a60e1cfd1ea004fcbcb571f99ce753927b0729ed98539433f70d9077c01175b9f18b7e25f1911acda29edfd96fd171ae30dca642ad70dc342720b51b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}