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 0x312e2e40090fd663daa611dbc8fb95382b4f9439ad90e603aa2515f7908c73d5. 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/16a76816-97f1-43a9-8f00-b282ca2d84e5.json and https://artists.proofprofile.net/proofs/artist/16a76816-97f1-43a9-8f00-b282ca2d84e5.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 0x029235ce51c3d1e3e4a670badb6d87239c8d56653009046d1189601c0f7fb413. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/TCAGM2242893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230324da39489cddd82431399157cb9e944c9898739cf5794f87f4977a8a20d4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAGT2344149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12558a34eda4c97b06732dd54470daf507b26d8d8c70c81da3e54d0b131e2aa5. 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/TCAGW2306432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570232a56fbba911a5cbefa456702768a645eb35ad3290ead22f3db2f25a7902. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHN32305202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049ba44d653ed9a0b79fd9b9ef95595a4fdc3732bba27a1b228fb09abc49c0c0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWDW2399614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd0fe8d5e418261d9bc8c8a1daa07902c1ecf17e647672492f605fb5794ad64. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZYFZ2315419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd53d1a5d6d0a501f6393df7e62d1ab7934ffc2f385e2cdd05515873d21383e. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZZ662300540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc739eb1d7c8882bb0b54bdd55268d36d2e0cdcc10e5cca1ce7a31d92326a41. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZZ662303224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712043b92419d5db9a7e769db83d233a5f52a9067473dabfb19b8329264c48c8. 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/QZYFZ2392346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe792694fbc7deea02fb58b54d32cf0c771a662e1bc120a21eb23ab10c8fcbbfa. 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/QZZ662303226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3048f7177b32755d618b0c4ee18848fa965bdc88645a9b74585d8d5a4e6276fa. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAHA2347064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0aaa88cc701d04e4221c38106b705a63cf02a316f529ec10b6575c1331fafda. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ662303227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7990808c3b27079ceb9a881757e69bbd1922dcb1c0a959714da7d4dc9d45b395. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZYFZ2408439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd27df3a92b6143f6e997284672957f450648f25ce61877151a3eedfb6957ee. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZWDW2427847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037db5c2769d4d69f2bd87f68ecedcd21cc7d2a14bf341a3f5dcd217dc5c1061. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZZ662489535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7990808c3b27079ceb9a881757e69bbd1922dcb1c0a959714da7d4dc9d45b395. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZYFZ2408439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde953e07cde892ecfed3fc40df9061fdb76fe95e1bdb3dfe44152a8072301324. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWDW2570145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722a3690e14c36775ba25d2e0a2be9778e04ad00585398062a907e3a8a2e460c. 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/QZZ662315519.