{
  "manageEntity": {
    "action": "Save",
    "entityId": "147383",
    "entityType": "Track",
    "nonce": "0x4730b15120a99e560d617c05b2c25ece2392486f8ba117e03d1a777a30a5683f",
    "signature": "0x98d5816925643c82f8957512e47e57c4a2ed4c8f30d183ff4dc20339b08b69a10d1df5d5d7d049dda77a53a9cbc74094faaf228eeb3ac8e3c8d6b46b569ae08b1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}