{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900130103",
    "entityType": "Track",
    "nonce": "0x93e329c8932534edfeabf026a9644a933c34177455f6316a79a1e9c022b8e1c0",
    "signature": "0xe760b53af29734ff9590b89eeea811b362999ef4cf69697afbf37f64ad4beeec47ba048cb97e5f60e04b6b6fc6e70dd91b4d9b9dda36bf73845857c44f4b40bf1c",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}