{
  "manageEntity": {
    "action": "Save",
    "entityId": "146284408",
    "entityType": "Track",
    "nonce": "0xd7d6351b3adc5ac64b7216b89e08501116e555db8ce8831d72c0dbdf07e3c897",
    "signature": "0xe07a56523fab37f100ea8e838a328753e237bf623c3904ba70614683a29c36fd5bfff172325c51a6e46f86e1e775d22ada850c86dd8a3373cb8a3a32329ca65f1c",
    "signer": "0x148cd05E851795b6BD8A5E8D818c12360BecF2B1",
    "userId": "436176942"
  }
}