{
  "manageEntity": {
    "action": "Save",
    "entityId": "644217986",
    "entityType": "Track",
    "nonce": "0x3302195a17a5762cdde808a115ed75d35e205e251eb0732024d0a6009d52cbb7",
    "signature": "0x56df6c4ff5b134cb03b40887211763d6ad639f544763ecce60310f2882c4e80f650b04e32dfafa39ba2fc6790fe22f2b9a8c365552e3f37f5c838c803c7a61dc1b",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}