Samo ( – ) was the founder and sole ruler of the first recorded unified tribal polity of Slavs, later known as Samo's realm, ruling from 623 until his death in 658. According to Fredegar—the earliest
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7757eaf8fc63f7eedc857992b55157cb00cd067433743ba646f5546b23dd1c. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05b0d29b-650a-4c7f-aad8-e5f16f16d4aa.json and https://artists.proofprofile.net/proofs/artist/05b0d29b-650a-4c7f-aad8-e5f16f16d4aa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).