{
  "manageEntity": {
    "action": "Save",
    "entityId": "1666469057",
    "entityType": "Track",
    "nonce": "0x297fb3dc6a9367b1e70241d24f503b18c9087b8f42474b5a186a645272cfbacb",
    "signature": "0xf8d8cae1d08881fa01a1c9c754d5498f73158e33d4ca237e1538fd7c113560894d5e18ba7490588a5621017c26223896ee1fbe0fec5a826328db2139c4f10c861b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}