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 0x19af2871d6667cbca960252481f027592649a95d6a3c48487fdf22c25121ef3d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e3e6675-3e97-4c4d-8b71-8095b354a52f.json and https://artists.proofprofile.net/proofs/artist/9e3e6675-3e97-4c4d-8b71-8095b354a52f.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 0x47a5559a4a24be9e054af3d96c54467282e01025a66c093e2babaab298146422. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAHY2479454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f19fcaafa175bc538da00b1dca2ad6313e5f2bc9daa68430210c6736485d3ed. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAGA2275808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfbfeb8edfedfc6f0a6e4912acb40178119184e5ee7d8ee71d41cf58d56d5d0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QMEU32002551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d50b053b18f8509a0ee93aefe3955bfad2dd47897240a55410ed6c3d9388ac8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMEU32002552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9d6a71661581af98466e3b91869d7dd10ab38b85e101dd2f2c06165d291041. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMEU32002553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd5cafcb0029a1d1c5140381143f7955cb8f5320eba7532971d6a479a171a11. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/QMEU32002554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da3cac716e0bcfe1a94510e9c8deb4afe93d0c8b3265d393aed8b42583f3eb0. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QMEU32002555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c3713266631daf3127dfd98b5978e6186706b12bee6660e1d24c3a52e66ce6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMEU32002556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8ea4165620d389c19fcf1fa56e69653964f5680bdce337a6c876867d5c969e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLS8S1900040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79452bc3a53a7d605da20d33e24476f3e3feecd7a2794f3255a3c81ad6d385d0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMEU32002557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca17f7b4245f94b585285c33d92866003cb63846244e897fc291646ac9b2867. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/NLS8S1900051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f81a67ceab27a2552b5ad4ee40bc14483e95688c5481c51644be498a023fda1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMEU32002558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca3d5a06ea593c90291087964b0b49fd74ed201ee715d517de63a4fe19b1e82. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QMEU32002559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd78039f891e0ffe31f7910f97ef0e32ab58e72653efd4a2bdfd976dabfe2529. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMEU32002560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248fb705c3d4713feff7c2a934e08bd9f7e7b627df9ec960243764df65b449d9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZJG52423745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b1451aedbfe472b887ba93f1638120fdce224b615b84e990666b09398a3c05d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAHL2310134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16655e624e1b89f0c5b19a305ae7f60af56199c355b8d8d8a886501c15c2c636. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZNMW2373198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4106063d13a678ae09233ef2fb688052c9590f060ec2ebcb2bdb38a0c2ab30. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNB82355128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd02700e468ae367f2e32bd61ced7ce1f50766f6e398c5b4f5ce53dba32b0094. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZMWW2337953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3254ce3ea2c2619943c28f5266849fc05a78690d6928d8cd32edc0f346e52865. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZMWW2337968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948e6fb6e56086e9eba56d8abd95c4053694cdeadde2554c758d424722697ceb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAGK2284954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6911039c7d301a0d9a318f4cbf86dd08411e6f192cd4478a3370c64d4aa16b6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAGG2211604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1553b334a58003fb1ae207fe3add22453cbddcf03b2d9ced731aef442b3769. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAGE2209799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b66bff3695f497abb6b8a3b759dbd7912155451c1873f88a76d1633bf17e05c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZLL92249422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8ea4165620d389c19fcf1fa56e69653964f5680bdce337a6c876867d5c969e. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLS8S1900040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78eef7b12896b8d41bd2a6dc6c9966a763a21092b90d1101b7665d5e77a7eb1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLS8S1800026.