Heima (; at home) is a documentary film and double DVD set about the tour around Iceland in the summer of 2006 of the band Sigur Rós. During the tour the band played two big open-air concerts at Mikla
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 0x99966dc2c0028a3bf44730ad727162ca97d5a2d376e255edbb4c8eddf597da78. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8825033e-88c4-40ff-9c36-85b93c8cc02b.json and https://artists.proofprofile.net/proofs/artist/8825033e-88c4-40ff-9c36-85b93c8cc02b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).