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 0xbb48c81137c7fc4a25236e5925cbbf75e2539d2c4b0f25982eff74f0e1e1192d. 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/b9c90a33-d584-4cb9-a205-be9c757b36ad.json and https://artists.proofprofile.net/proofs/artist/b9c90a33-d584-4cb9-a205-be9c757b36ad.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 0xa124fdbf06f659fb31c2cbee109b3bbc6df61642f807d0b15e588270c69fb386. 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/QZRP42420933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed24b78ac290fc97afb158fb139a11edf56ff1eb121626550e28efa5e1a454f. 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/QZK6J2450333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01dd9b1991d39431fd43848efdd932303750d986591b4c3fd2410cf14ae57f02. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZES72462016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb240d28f41e4bf437d8829708b405289e5721f27ff90e3beb322dccd947a1032. 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/QZFZ42479433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389800f01e299945b066c5d61cd4a4fc25d321f0e6cf6632f58ee11afd02b595. 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/QZTBC2391416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1409a96f5ec6344991413763bf0682be076fe776fa35ff722ffd8467b095d558. 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/QZTB22382320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105b8362180f1777d66b8aa5c11e3c226f31f7333da395b514c766a76e0a5017. 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/QZTAU2364676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd281ef81a04bb230ed2ae231df31e9d603db035a0c5bfe96ae384085ead806f5. 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/QZMEN2300170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7026d5bd5947e168c3df96090f712da3afdaf418e7efe80b49ebc55f895071a. 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/QZMEN2300159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc6b5743b3ccd34ed6c1181b73a7046aae282eb7a03e37f2e0e6a8d791f00a8. 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/QZES62304877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e66867aad43ceca5c4c330084e76e1c838e100b52c334b1c69e996e1d21f5f3. 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/QZES62302604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf94ce3ed62c5d06dc20e93505a0df4357eb867e25dc3badc8073089b634f47b. 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/QZES62302480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26df974e14d080c3244ee16b86b1464ebdd203d7ebe7428e4f6c619d338f0be. 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/QZTAX2209384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511fdf4142eaa80478dd9970a56bd9d55e21f3ab7357aa6dbf910799b62fb3cb. 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/QZTAX2208657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7854847439f40e9f0bff450be79acbbeb01bcb675eacc95d9fdd2e684fd4c9e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTAU2225560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e35574f4a6407cb6d86572a287c64073328219b5ceb8d23e4f979079bd344e. 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/QZNWT2262276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220eaa0bdc0634ba5e11a39bf2273e52bacafd5679580c456f28369ba90ee032. 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/QZNWU2218004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5dbed09f41fb9ae4af14b52b1abe30ee6d84b8e46542e2d72ddaf5a986405fe. 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/QZNWY2122308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55110188458f4f3539d7c782eebdc31a70f3dab66312534055aa888bedc1a060. 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/QZNWX2162736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b671a5863db3522e5bd4c20bb8f63bc5f3a4d3cb0d9633e1c8892f502127d9. 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/QZWFR2453001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44efe4fd697801d134c4dc089c00c3d85a92605fb93d9663acea1a8751d6cb3. 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/QZWFF2404384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1fda8a005259cc07770840cf7e8577356200c20ff3bba40f1a42d7b30a788b. 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/QZES82557723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd92cd920d6166063d4dbc40bc2725d6d35fbfc4e12306798dc55c1340a0c15. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZTB92588316.