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 0xc68f47400f95622791a8052728a1f722ad5955d5d9e71192a02f73376c688a45. 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/aa5f0fc5-851d-4256-a6cd-fe9e1b383caf.json and https://artists.proofprofile.net/proofs/artist/aa5f0fc5-851d-4256-a6cd-fe9e1b383caf.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 0x4f721688063e780d184ccec0ff6b3fd4e6f1fb40814aeea26f84f9a8cda4af10. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZDA41861676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e50e9c36400c732939f8f4e6e9fa2c31de9a893aa7c2c7c176a24b219e1253. 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/QZDA71829846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946c6931c6dd1d4bd95260dc1492c4187dd0b363d7dcd79caa5af6f38e0eccc5. 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/QZES71852217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774c93afa44d789d77fec1659df9824d32757cf837ccbcd044c2e6eeadc31aea. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZ8LD1911944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1eff2ed0b07c7f45b6a1ed11cb73e78d02e5de93fcfc657dd47b709f1b21b75. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZES61943703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f435945c41b5a6d74bb7b02cbd7c8955faeec397d0895b880c8ee4e041281fa. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZHN42002655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3bf4c4d96b444df938c3f971352e695c0fc38a0d0699866c074d99c6787c4e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6P2034079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c21d4eaf1ac88d37c34650de1ff2b6d338be661a5ee798275c7a60ed27b6c4c. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZES82120061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc344db441ea87262c6a6f04b1ca447a2a9889934bf8d3c0ad932a0b8c6445a65. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZTB92239794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a2c07fc1ff1a9b1acb05988c924e5db4392d59fea0e699cc4bdd9f9bb61e45. 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/QZMER2308194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1015153581e119d0877c6b1ec5cb05ff11e18b8cbf471689f7059b556775d63d. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZPLS2426951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b31fcb253ee28fc83732d6fc950e383fc9f550a625936759f0906511273e9f. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZWFJ2457208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a334ba4cdb54a3040a5bb82fcf8b92c1c11c6f7a58d433f215be3ce0ae24e7. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZTBD2515718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81211ff574188068d80bbe2e9b6cb71f49999ae71643eb531d8112d8a9fae728. 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/GBKPL2202589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b475cdc6b92099393b415b6081ca72c605759245722ddbc6c2e9453c7de1f1. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZS672118513.