{
  "manageEntity": {
    "action": "Save",
    "entityId": "752984",
    "entityType": "Track",
    "nonce": "0x742e1b42eee2ee8279347242d77cbba57cdffa729cdeca935038924a3df8f1dd",
    "signature": "0xe38310cb3fcba65be8fa3fa66d1b7160c952d2f8bcb04b10eb790fae827abc5f558d498adda7c40c8004cde40ecea104a797afbbcb800be6f9caa51351cb9bf31b",
    "signer": "0x4E3828bc809fb5B9deb81fa536cF73Dd5bF4eeB2",
    "userId": "185184169"
  }
}