{
  "manageEntity": {
    "action": "Save",
    "entityId": "770123",
    "entityType": "Track",
    "nonce": "0x07e1888d8fe8c95b053318e0c378c6de392fbee37c7829109d4531e86866e041",
    "signature": "0xdac41d77e281ea5a1710de7109ae2e3c6784ff61c52f7d0e00a86ecd766b2dc117be41eaf2097f32faff519a8e61e16ad0c9608d38fada3b5e129b9e3ef52ed41b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}