thumb|right|200px|A , illustrated in the 16th-century Aztec manuscript, the Durán Codex A () or skull rack was a type of wooden rack or palisade documented in several Mesoamerican civilizations, whi
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 0x070c026a3c801aadafef2122961f4ed7ef2395f4eb3b9d53f8274ad835facb73. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92826944-e1e8-480d-9bb8-2570c227018e.json and https://artists.proofprofile.net/proofs/artist/92826944-e1e8-480d-9bb8-2570c227018e.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 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 0x947b396236998916e6fb04fe6057995d7837389c17b3da7e37992fc74799fee0. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/USJE72215402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d3337f7576dc4077afac53c2cf308975cd1253d8847bb7067be0f83eacbfd6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USJE72215403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5a7d58360e6a0fc01d2d80945dca31928bf09afaeae0025850e8d14b0e125d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USJE72215405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947b396236998916e6fb04fe6057995d7837389c17b3da7e37992fc74799fee0. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/USJE72215402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9effeb93abe9c05b30f3e2eccc7506ad34c5444ed794ac9c1bb9c3d01d10da40. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/USJE72418801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ecf22adc2de7b568c7e243d6d3440f78e319fe09c48ad1c412ad181d04cb59. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USJE72418802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b0f4f9ebf1fff36b7f174c2d2884dbb6e5bf481452ed646f696876a2072b70. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USJE72418803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3567f47c85a96000e184bf280e5c6d87df29ffa93ed49e6eec4f1d4637c1c1e7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USJE72418804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a20b28f2b194fd2ba849c97c98f867a75082542acac2adf60550e9cfea1d55. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USJE72418806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ecf22adc2de7b568c7e243d6d3440f78e319fe09c48ad1c412ad181d04cb59. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USJE72418802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b0f4f9ebf1fff36b7f174c2d2884dbb6e5bf481452ed646f696876a2072b70. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USJE72418803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3567f47c85a96000e184bf280e5c6d87df29ffa93ed49e6eec4f1d4637c1c1e7. 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/USJE72418804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c68b15ee349f974014ef0fce602c9d11e8cec31ab118871024130fe3591f57b. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/USJE72418805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a20b28f2b194fd2ba849c97c98f867a75082542acac2adf60550e9cfea1d55. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/USJE72418806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9896a9f864080dfe9f8142dae68b74f85c0f37ca5b15e7512477aa33c1c9aba7. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USJE72418807.