{
  "manageEntity": {
    "action": "Save",
    "entityId": "1675921302",
    "entityType": "Track",
    "nonce": "0x515f53114e2a3f87b2f828f818fd5662aac21bf7c241d379d99b3312b2b35717",
    "signature": "0x0b9de1afeaacf45e55e1a1006a605bca4e6e0693d688dde415d608ed7a5e5dac0bcbf45192f1e08e60e5daca7721b74221bc2b95c6ebf2c1b837402e3ae70cc21c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}