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 0xab6922983c5d442a515090b2a2e68d4173ec0b6cf217ccadb9fb5b81ba944773. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e5cfd31-f322-4612-8602-5ef470fa5591.json and https://artists.proofprofile.net/proofs/artist/6e5cfd31-f322-4612-8602-5ef470fa5591.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 0x260bc913116539de542e642448e66374988dbdda9ee947512705f63c9801613c. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZTAT2571055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a297cb1d2707dfe325c8e0750c15fbff77de4ce747115ad5cbf48079a2601f. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZTAT2571056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c3bd480f994c87f55ec96854802c97426068684c763a7eb09632c188ab47d3. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZTAT2571057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb7258e586591d2f441e38e5aedbe95936160b911f2374bd130ad5ff9c510fe. 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/QZTAT2571058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b98adfb3555b341394fabd6f356e6450c1d116d3963f22090fa7d77cbf832f. 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/QZTAT2571059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745c48dd24929d4685147f28fa0e9def3b9fbbf62849150b753e82521fe2c435. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTAT2571060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f866934987fed799fba040c6a20cf9b2f37742234bda28f3846d40fd2f8b25. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTAT2571061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0726c983f0df5ed05c2c59cc6e8d0c262da681327db0e8808afa2bb546c57b0b. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZTAT2571062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1639abc7679a766b91bf21c28f35e7179fc42674ccb9f638f8124216bc0479. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZTAT2571063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1000d4a876f7ba9dd03b044aa83f2843cb6a55d683b8a139163ce5eeba0f6f0. 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/QZTAT2571064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488411e6f46e3f26a00efba147ef6a7a4f3b4384f9925b3a5747b82076470d3d. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZTAT2571065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e477e858a8817ec790a0852bf60da8c55fba8ecbac775e7af4337dd0540cf86. 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/QZTAT2571066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacc6acfc9cb8f8590203bd614a63d08c760d39ee5b8427f9859063323ea19d9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAT2571067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ecb693da11f9acd284579d18310845bcd30f63c290b49ef7024ce1797e35b41. 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/QZTAT2571068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ddf7aa8161aae642d30d5ad10a854faefe22338359d59424bc0b66dc19cb53b. 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/QZTAT2571069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c3bb97f2f65e77af2197632181f3a04b8ae0652d9ed15bee9f21efdb09509a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTAT2571070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba860846cd7cb96ed86e38fe77591d70b2fdbf848f2a37d32b420fa7cb4bf6b0. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTAT2571071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5586d67c988e38f46b95e5b196dae07a0b5bf61e3a5c78e54c5e692ddd18960a. 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/QZTAT2571072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371bc47072a206b0a28a9b66ccbcdd9db8918ce9bcb6e4609cfd919323664e72. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZTAT2571073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca31b7399f7ca2a59f62a56cf6f06f22e1787ad7b4dd5b18f4a8d78661b45c0. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZTAT2571074.