{
  "manageEntity": {
    "action": "Save",
    "entityId": "423427463",
    "entityType": "Track",
    "nonce": "0x4bccd74526ef9eb246fef12f99f2f9700a2a176b7a118fb55150ab01e42178ee",
    "signature": "0x25f816e1dc2bea0100776387a2b8f843f0852877255deb4d573b24950150fce347052b43064b8a3b77c7290822132af0edca57bff0c65f35a1826202877388411c",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}