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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0fd1729ede105417496e2e0c4ca4dfb5221789d763fce742720e73faa98c1e. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3907543e-29a3-4f47-a725-79efa67dcac5.json and https://artists.proofprofile.net/proofs/artist/3907543e-29a3-4f47-a725-79efa67dcac5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b616fd9b2f35ba4a3fa6ea5bfd9d4d3cf0d0203f317a0138d890223fec73080. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-20T12:03:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL10N2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4abc357d2e5fcef675ad7d380bd9909ccf7b8f0c0b2e304afcb33f25623b0376. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL10N2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf116799aee8fb0fa01c4be902c082d29cf5139f36da7d94cb6dc6403c45fe536. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL10N2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2199a74edae27db5802d1ae29ca75f47f8d3814deeb6ec99f31213ecf1d053ca. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL10N2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3638f3596e01d6b9ee425601c74536049a697c745316b9cae3c203b32c1d676c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL10N2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c0daed33441cf2c60118baa67b1625c7b83d744cfe6f9b01f750fd713b45f4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL10N2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04976e3aeec86faf1bbd39cdcd7aa1678cd709992afdf92c41d041fefc872b3. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL10N2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fba78330d847079ecfd4416ac6985abff2869ccf88aa6620edce669ac4bf03. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL10N2500003.