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 0x011dd9b4e2a48cda41fadff7d8ca123dc3f3eaa9c2207bfa9da0413922faa597. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/06af2edb-3f27-4a56-a113-71f8defaad3d.json and https://artists.proofprofile.net/proofs/artist/06af2edb-3f27-4a56-a113-71f8defaad3d.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 0x4a3905a5f236b5532bd0e3e951bbcfa24efbef6a77c3a6e32920c8ecb81a3158. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCADE1737487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcff1aa9b7607a8681c83b8704e208e928f8dad8aa51e64b1ed9d4ab5d7fb20a. 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/QZDA41818752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f6a2e04ce01458ea775792f9b183ed19e1bdf8eaea917e290c792650c57187. 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/QZDA41818753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c83cf69fbb436d10331abd41ecbec64aa0c43b2d57646bac848285b8da872c. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZDA41818754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89eba04338c17988861c052682e6b8918c86df1b95b5342fbd53a1e4aa63a0f3. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZDA41818755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29ae24d541e259a2b5fd4bff4119bc8ab5a16e93eeeb131fe610321b22dc51c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZDA41818756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc09a55a36ca7fc68bfe4db4bdf90c1404955dc215444ca37c233bb75bd6cab. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZ9JZ1773523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390ab0ff1780d9bd606dfa62ab485e49a61fa270ec218cb051386bb6913a76b2. 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/QZ9JZ1773524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3517a3fac1904d97ab182a728b4a5822243b7ef83ce87139e1039dfef97b92ff. 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/QZ9JZ1773525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb303579e4fb3073e755cf834446ecd0e4a95a85ab6b61ad95f376e71b5a51894. 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/QZ9JZ1773526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd515a51f824bf74cd9c75c714c9dc7e861b8fb70ee925d6b209e194b6caa13. 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/QZ9JZ1773527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6f6c1d349e5fd6f045fbfbb8397654c41a49506749deb810b4f96a00a15387. 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/TCADQ1895815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc30fad01e9284d849f8c492a039cfee9287521c3f6d303d0896c1e0f47fd2c. 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/GBSMU3260024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29cb9dbdf9796d7a3fce24d9318e291bdb266239adb4efd950219c367524c60. 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/GBSMU3061149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4569185aa5d42ba7822c04a889c5af52c09ba33d8e2bb93686077e08a453e2b2. 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/GBSMU3061150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff076e1dcaceca912e58b9e04bbecc2072cdfd49ecb91d5e47f2a635e297ebd. 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/GBSMU3061154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0ffdc97a95ec2ffd4c110f82c97988c6d59576c32a860277f487fc9e594bd0. 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/GBSMU3061155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25532b6cef548a3f5bf56d425699fe89267bfd226a51ab27c5d812ffa4c2f3b. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBSMU3061156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c507812b394515492072f42b8b0aec6a1a44808c95ec793b807c770b17b91d7. 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/GBSMU3062852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6c4e67acda47b1b7fd91723f031bd6ffa52b7718a5eaf8825de397b42d18ec. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBSMU3062854.