{
  "manageEntity": {
    "action": "Save",
    "entityId": "1875491134",
    "entityType": "Track",
    "nonce": "0x2b860c100fdb8dcb7a412b13f46828156ce1a1250d5adfc18586bd1b7b67021b",
    "signature": "0x1f449bf4b766f2cd56df532ad4bbd71efcf5808395f4482b7592dd7b3df325c93c14aa895a2a9acee96511633d476afefbe7966c1f610dbf4982c8d7db7b61c51c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}