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 0xadc8eddd3ec9a312796387f106451a6240b270dab384cdc425f9ef59df444d4c. 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/b434b684-4d98-44b6-aa52-fa03e2be8490.json and https://artists.proofprofile.net/proofs/artist/b434b684-4d98-44b6-aa52-fa03e2be8490.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 0xd281e20b35cbdbaf8692a57debe5654385338a3b78c1eb3ec186ba58228b9bef. 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/QZWFJ2566036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed83b7037bd2a305b5f7eb149af206685a08efe6aa00f944bb1645fd6003116. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA2P2200598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51287a88921221839b5efbb5546945363284815dfaaf4547b6709722d8c08003. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZMHN2368330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d92ac3bd16ac3843dab00c47faedae75a23b9cd34f45a37502cbdb79c2a7f1. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USA2P2337123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4f3803c6e9aaecdd620c1cf15d30831e6ed031caaecdc6141e8408bfbc11d9. 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/USA2P2327631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19273d7f3df3503090edbb12d733f24ae3a12030fd27f51bd776fcd158502863. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USA2P2223482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554135390e035f28ba4c93989751855426dd1b4e14be2e9aa5928f08903c8336. 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/USA2P2223483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0dd4461efc3c543ba8a2c86bf6601f86192f5326088bee1091fd73b97b72202. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USA2P2223481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e585d5a59535554ea9a61e62b5e54e801bdd1366270586b8709e5916e5c5934. 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/USA2P2210287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e585d5a59535554ea9a61e62b5e54e801bdd1366270586b8709e5916e5c5934. 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/USA2P2210287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8447f9dcd568b82f5d2feadbe605ab056fda25fffcc825d6232d51661a6b1e. 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/USA2P2345893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed83b7037bd2a305b5f7eb149af206685a08efe6aa00f944bb1645fd6003116. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA2P2200598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399eb12dad37ed7998653d1c88c39b3f4bb4238da44138e5b5012973530516af. 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/USA2P2240435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8021b637d2b539ecc76ba475d2d2f5b5511b55b6f846984f7d6ba3dd379b72d8. 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/USA2P2235364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399eb12dad37ed7998653d1c88c39b3f4bb4238da44138e5b5012973530516af. 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/USA2P2240435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51287a88921221839b5efbb5546945363284815dfaaf4547b6709722d8c08003. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZMHN2368330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07a1281348177fde08529f35e7265d9f4c309cbcecda4a0b528bc19221ba018. 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/USA2P2472410.