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 0x3f3e07e885d6191ee4aba26840797ebdd6a385ec84489b1830c314ac280a49fc. 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/7d807ba3-04ed-4588-b8e4-3308db22e1c7.json and https://artists.proofprofile.net/proofs/artist/7d807ba3-04ed-4588-b8e4-3308db22e1c7.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 0x572fb0b9cab97cb831ba31646564b096f8bad1906a46a2c6d85ee54297eb3d45. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/IT8009504590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6529fc8e51bdbd611776e4f648ece451b9fc29dfd4414d2fba12e1d6558a54e. 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/IT8009807610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7d1e34075276e8cdd0668e0a5cef2d36d7d9738092f8bbaab4e6d624396cb2. 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/IT8009807620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cf73e3b5007b95d8a4ca7980de5440c44abb41c1c56e95713224d90463db44. 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/IT8009807630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b43d09deda8a430f9c36e0267ea8df33acafc76af2ebb52518f44ef7b71716a. 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/IT8009807640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1995630d5f9305302d65d4c13c90bc490d2c7a0c4809dd64c592aa72d9b02bd9. 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/IT8009807650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe19dcdf475494cb6c8f57d9662c212c8549325803bfbc4c6eefee81dd4ee1283. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/IT8009807660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb524aaa9c0e0e23d965557158591470a7f791fd44f4d4745afde294d71aaad76. 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/IT8009807670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4a4acc9a5744e44c2d95fd2074d48be2b501faa1ad932e5f2be84518a7d564. 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/IT8009807680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9725e44d63417775a33691a2569b610851590642b215d41b61d0464c9596621a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/IT8009807690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed4df284b50fd2ea1c0501809178cc6f7a473a91952a0bad336cff521c487c7. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/IT8009807700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7d1e34075276e8cdd0668e0a5cef2d36d7d9738092f8bbaab4e6d624396cb2. 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/IT8009807620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5727db5d10bd760525ed62ae3383c1b289157d0a004ba91972237b2ef3ddfc. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ITH000000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b43d09deda8a430f9c36e0267ea8df33acafc76af2ebb52518f44ef7b71716a. 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/IT8009807640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae30c30bcc42155eca5ef5de52f0d6591e4fe33b53fefb71a0615c9181257126. 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/IT8009504600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb524aaa9c0e0e23d965557158591470a7f791fd44f4d4745afde294d71aaad76. 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/IT8009807670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca32b8b88dcdba42f6bf17802293f320162895666c4dec8b9ec84c88fbc6fb5. 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/ITH000000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6529fc8e51bdbd611776e4f648ece451b9fc29dfd4414d2fba12e1d6558a54e. 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/IT8009807610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572fb0b9cab97cb831ba31646564b096f8bad1906a46a2c6d85ee54297eb3d45. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/IT8009504590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1edd1d20532bcae2609a743e1ed2fd019bccb14e83d3234ec58b7ed34e2b6bf. 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/IT8009504630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed4df284b50fd2ea1c0501809178cc6f7a473a91952a0bad336cff521c487c7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/IT8009807700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4a5f35d0a1bfcd000a01fba78503f7799b2bc0f13a06ddbe503cf0e266bdb3. 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/ITH000000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1198fd1a33c85a484f472b1a576624f959c8de18bfdce2e597ab66bd9f6361. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/IT8009706110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd379e086f9e722a94211157b4344a61e5519d932c54bd8140f4dd50d6a1396b5. 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/IT8009706120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81eb1a9793a082ae8ee6a197203c7fbe7eba69b059ed6728f6e476ea516612de. 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/ITC940400550.