{
  "manageEntity": {
    "action": "Save",
    "entityId": "1640980776",
    "entityType": "Track",
    "nonce": "0x74bcb1e860898aefed2907b4a31065cc7a3d3ee12dfabfc17981d0856616b5e2",
    "signature": "0x6315ebe42978cef23113f1d926f5974310c6b833e0201218e4b1ff35872af26c00db2407da96cd26846b4a763052959847452d9120e6762aa550c238df5d52451b",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}