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 0x625d1c6eb96a15f4116d0d76092bbe9e4c713282a4ab4c3cf9f78c640ec98799. 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/0ad71f26-ce22-4c87-9863-b88220ecdb40.json and https://artists.proofprofile.net/proofs/artist/0ad71f26-ce22-4c87-9863-b88220ecdb40.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 0xf5d8551614bd210124372856c2bf6f421117d215098ea2c2cb9cf102c0191af1. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FIUM72000306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc95d443dce62b0ad33a1d377171f2605f235121356f15dc26f0c362ee54b570. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/FIUM72000162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0def72e42b258a1d27c1eb85de3367962d22e26ad031600de52ac9b4d818769b. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/FIUM72000354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17efe160b4d3ae34aea2692e84ed669b09eb4f2734adf80cdffabfd6c6e16d22. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/FIUM72000355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63cd976f4f97b798d6f9c8ca820a392fc91d68d15f373cb38f6fbe740ec5c7b. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/FIKHY2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3733438b3de304a611b46dbe7ed7403b9d10f63b9b6a2807a93d63386bd282. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/FIKHY2200065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fffbb4ff1c94e6de7d8dca7d9baac4a3e6e607e65b56bea0c7c4205fffcf1c. 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/FIKHY2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f5ce8e1aa93d87a93245ade480cde2b87a61f5aa340391ea1eb4008b9b421a. 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/FIKHY2200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7026b07d5a14ef7550476abb6ba678a684fa4b1d7ae53c6cc7124cc37d9749ee. 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/FIKHY2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebc269b12b1888ecf028209d7d1b2222212946450a728df840bd82776e01124. 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/FIKHY2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c4bb557ef313bb94ee146db82de204b339b65aed3173b460637f95b60eb94b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FIKHY2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63cd976f4f97b798d6f9c8ca820a392fc91d68d15f373cb38f6fbe740ec5c7b. 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/FIKHY2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24190fa8d858d7171c3b62dc396ec19886bcc2b66c5363a72deaa6b0804d5236. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FIKHY2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2a2d30a18a1b49c207cbe85f4b24dc23e8451c56df2023fec39221f6c69dc8. 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/FIKHY2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1717cfab7d10a2ba7833c135dccfb5809a6e481cb25cf0e5ecac98d9c061b6a5. 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/FIKHY2300065.