{
  "manageEntity": {
    "action": "Save",
    "entityId": "680403201",
    "entityType": "Track",
    "nonce": "0x6bb0bb73978334afb48d9cb8ed360cc6d6e0269068a74942a02737c4a3dd6485",
    "signature": "0x32d2f357851e140fda7acc93c0b1ebf91d936b1dd4d0343c3ea6bd3e49efbc573795889d74af9ffefc5aaedb525a50d7eb4c8e6579c21a50465e2eb9f2fd5dd41c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}