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 0x0cade5932c302c41aced0ae9da55b995da5db729ca951c472a5db0c160e816b4. 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/cbcf49a4-3e98-4246-bdef-a780a4c6fa7d.json and https://artists.proofprofile.net/proofs/artist/cbcf49a4-3e98-4246-bdef-a780a4c6fa7d.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 0x515b8523983b2f572af06f6dc7e24f999e9d0e51cdbe816e2683e0093c761cd8. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZMEN2010191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cd206bcaa9d098c75ebf30615557335bb9c1f0978f9b96e807305a964a222f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFYX2241755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1423a670900070726064806eb93412193db158f9f701f674afd0d19f7e975e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFYX2241758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd027b7a83061dba073628b6951904d690a3ef3f5e14a1af1935ec360de247e. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QZFYX2241759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9bb1612e039236188c25d0f8c5e5360b9a63a600f8c59187045107188b1b26. 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/QZFYX2241770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54171d69ead676b0c08e1e1aba51520ea706612803b6495a8c0ec30334b48c5d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZFYX2241774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3c44cb28c8973b8d75a1ce261728133d613e963b37af2bac6e0ea1cf66f6e2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFYX2241776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d559b9237e836de2bea1ef5bb40ed54b97bcec8b3cc87cc516ed760d188422. 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/QZFYX2241780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893a1b7c6ea38d738d92e364f01bbaef4ca8c20b3781a3f5396ee430a8baf7d2. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/QZK6G2242896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd210ca6bab446216b444a9a4e08a77cc5abf13b5cfa2e30c17d38b049ad56729. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZK6G2242898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546efc6fa4f831805a260be96ca2c2a3466f5a186a6ce902c24f0b811c82d6b6. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZK6G2242900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22311908096a698023ea03e6f44657be1c2f9adb9ac030ad613dc416752016b2. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZK6G2242901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437edd10c4614f820b19c12c17e35d56a3a43fbd88e302e92d29f390460ada03. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZK6G2242903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31594451b0f31ae259ee09740bb33f4df93dd40f4aa6031ffe7d573b55b6bd9f. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZK6G2242904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b11f7fdf5bdb7fb89cd47e8e04f406d410116a8c245ffb9b1eaffcbb4e68207. 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/QZK6N2366734.