{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "621412831",
    "entityType": "User",
    "nonce": "0xc116c9e4630b0a11385113bb4f9b58543e265a6e353c86d82c638498f23bbb50",
    "signature": "0x7f0120a26d74c001c1e7da30922a80ae978ca238fc9150282e7317147458a0a43c01476f48598c3b3b85a9ab4b437a127f9e21d727356a793b80cb2976b645391c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}