{
  "manageEntity": {
    "action": "Save",
    "entityId": "720179464",
    "entityType": "Track",
    "nonce": "0x6a44f423cbd24896586c2b6e0c9e61588fa41fc089049fc4aad4d39aa6e21f8b",
    "signature": "0x27f78f313acefd5294367194374f62a638826cf15eb9a70629ef8873aca042b608f11f5f21f412593fac49cc213d5344d6c8a6857f9d1373e959d8e9c64d203a1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}