Sandberg may refer to: People Sandberg (surname) Places Sandberg, Bavaria - municipality in the district of Rhön-Grabfeld in Bavaria in Germany Sandberg (Celtic settlement) - archaeological site on
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 0x0d872827262e50c506db387a5eb2839b0db71db1d7de6ba8db406746e753352e. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ce0422f-5216-452f-b9a5-f70c7d1d306c.json and https://artists.proofprofile.net/proofs/artist/4ce0422f-5216-452f-b9a5-f70c7d1d306c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).