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 0x13b9407f312f70de3938da45f70f82f0720652553de2f1d5b0d190ab3e0406a4. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1e50d24-e8cc-40de-b55b-6bf36e104a48.json and https://artists.proofprofile.net/proofs/artist/b1e50d24-e8cc-40de-b55b-6bf36e104a48.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 0x160a582e4df3ad12179051618cd786f280e77d6061fb1be51101de08e520e86d. 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/TCAHZ2456381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0b2491848b7414e2add5a6309006ae1b99137b85a076a5a8b3e04b723aded3. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TCAHZ2456420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1733da694e2acca3987d9e63cf7410f1426ed475a22f0bd4528a22b1774669. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/TCAHZ2456430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda2103b0482ca508eee4f6f6c8e6349b34381f90cdba7cb6c480ac4ad6a8ca8. 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/TCAHZ2456442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc892e3b8939faa0930cf3144f61122a4cc30d189e1a7a50a79bd39e0d15e233. 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/TCAHZ2456451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7a8aff4cade9292c08f834b463acbf6272dc200e61eaf0cce7551eeb73319e. 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/TCAHE2312651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c530dec56489342f2bdf0e02a2135e1cec830ea7b8ab4ca51c8d89826f2950f. 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/TCAHZ2456462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c381398ca334efb1ce1b8360982035008c86a588b00fdfe7639d009ef819c5. 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/TCAHZ2456478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512eecc227c336d28a99602e9f036d5a45cc7dd47a80b5f622fe46d9d003f10e. 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/TCAHZ2456488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25264768ff36cfac3d48df5c5ff37eb5b5632291c0c54d19ede6f7634dd3d2ed. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCAHZ2456497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b5cdc654fcd8e42fd762c4f28db1b53b2f046347caedca178833ee98fe961e. 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/TCAHZ2456501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76fdc853e2e6c15c0928528b955381c0609b9fa2738729a818d8839b323601e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TCAHZ2456509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd075c75bb2a17b56ce57808fec252ec9051f08d394503211fa7ecaa1f0ca4f7. 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/TCAHB2399187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08c5f7ea14d57df8812623689f29eeacd795b225e4358c8eebb4b478f0e1081. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCAHZ2456531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7a8aff4cade9292c08f834b463acbf6272dc200e61eaf0cce7551eeb73319e. 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/TCAHE2312651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd075c75bb2a17b56ce57808fec252ec9051f08d394503211fa7ecaa1f0ca4f7. 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/TCAHB2399187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc203d0dc732ca3351ad2dc0da36d5c8b05f603619dff8bf8bdf679644f6826. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZFZ72110387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669bc012d1d3f00ace0f8d603ae3764c69cd6148cfe68fcef01f74361b464fba. 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/QZNWX2099571.