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 0x0fbaf5bfe0f6159730a93d5f9992e3df45e9cfa6a08a5f1f319e885815a5f453. 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/394f46c5-4a62-4abe-8d7a-d274f6ed9141.json and https://artists.proofprofile.net/proofs/artist/394f46c5-4a62-4abe-8d7a-d274f6ed9141.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 0xb540d8a57aa9047215e96162649267da687d413b7739d3c8ae15d01691ad20ae. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USCGH1331167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b3297182f6915049af44d25efc74cdb4a4fec4c88ca4c3dab3bfa4b1575aff. 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/USDY41554646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab43de7b4f9f44a49e72982720457093be2281d8d13c6a00a2b45ab0ca9aaf40. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USDY41554652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be2a5e489c9ace55a5dc2374fbf96ede26748c2721d8695b271a865aa08d5f8. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USDY41554653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39aa6105cfdded9b9fd054931804d315543c99ecdc0f85139161803601a762ea. 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/USDY41554659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae5e85ecc059b51a4bf86448bb9e40b3edc4673024d96970c0e5dfef97ef64b. 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/USDY41554662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c68f40f20863d2f5dfa525bbbc55bbebea9bbf0b0c6fa2def5061c06be7138. 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/USDY41554663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a37a62a3df6720220d3f79697f8e705f0f9b9cabea65987172038d0885fb5c. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USDY41554667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3ffe17719c9dd13b0837300d182921b2d4ad5e9269afa98de7e10ca599c2ec. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USCGH1613902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e16db801f12d449f395481441f3e5b4f84559768f8c860d694750b331b3b7a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USCGH1613911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f499b2fe536fda73a6c6db61b4fc88c9bfcf02e73bdcf2b07b9a9738b280c0. 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/USCGH1613923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c63c6ab76d49a45d1505e4ebabf26d8ea01bf6859fe241e9109e38e9d91949f. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/USCGH1653744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ab48d61b40267936f463b9046a2cabc3d2f45192fe046e2cdd6c84992b44b8. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USCGH1653746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb059305869394e86c07a317d62abe2343e580ce98d0161f70711ec29bbcbf957. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USCGH1653753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22b8ad4ca95b741f5c32338cf8275ca76abe252af642f2f3cebd15d69466ecc. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USCGH1653754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4871da3cf5b9b67ab4f26ab318e3f762bc71201799c9dca3df3292c8c242f8be. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USCGH1884023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7a252c88a917d752091b218f02d7adb2747dda71ee653d0f957d060e343a5e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USCGH1884028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80eb27c0230647c0dfdc7d901b79ff14de5c49c6c56ff655a82e4ab616b0fbc6. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USCGH1884036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49169f68fb3a1114a0490985bc5a6765a74c01d3821f8e9f7f83df21936ffde1. 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/USHM21923090.