{
  "manageEntity": {
    "action": "Save",
    "entityId": "974893777",
    "entityType": "Track",
    "nonce": "0xbf1601bdcfb75e8f807c05dfb3892aa527c0ef05fca9dba6fdf2b2e7523e0ecb",
    "signature": "0x99841583af5b23652eb33783f031f7b10bad68882217eb92389ba4ebdc026fd74f7afdf53be68466bf7df92091d8ecdd1a35e647a29234939b4ab9040bf9d1351c",
    "signer": "0x6FAb9f7Cd20fFE05620b6A2c0FAe2DfADAACb1F8",
    "userId": "291038"
  }
}