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 0xe71a686de657682e271d837df01847406fd19c3b3e992f0bfc72b7ff7c28dddb. 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/29f3f407-7511-4376-aa0d-7e4ff0f3c4ae.json and https://artists.proofprofile.net/proofs/artist/29f3f407-7511-4376-aa0d-7e4ff0f3c4ae.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 0x89da44622b8d8b849fa2e1f135f7c4a457b2f9a1f762fb9acf316b67347ed478. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTBD2438975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c30ab79473ee8e5f1f0f02a3193d82b8be792486e551f961c85409ad5b3f77. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZTBD2414167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25917f9eac735287ad3dfbe2b6e2cd4a1cb6102dae641d177468351c33d2fff7. 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/QZTBF2435949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd2d4cf98b034971ae87aa41febb92f62b43703a899a7f00919d9f54b58cab6. 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/QZTBF2472046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb67b2ab07b30ffe924dc520a1c5faf8435d324d39f001947c75c5da99eb28a9. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZTBF2470804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf24fd8c818ca170ab4de5e67fcd3d954f743582c69f804c8829662c1e785656. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZWFH2458891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc9fe4e2ecebc098658796c2299460225627be169bb942fd04051828859b1aa. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZWFM2434093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5798135eed38a084e1dcf62dd09521b1e1fcb5e0e62710e7f6dc35401f7ae22e. 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/QZWFP2450587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99708367ce1fbdcd246372d7aeb9d1ecb1f1db93aef63e26e9d7fcc483e1d0a. 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/QZWFP2451687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d48edc677bd0bb69d58bcd14f04c38d776267486ce07cce8a3f8d35b5a778b. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QZFZ72519168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8476cda5e06bab16987e88e1c76bff6506e670a80a3cc438986fb36df35dbc. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZFZ72565014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad348d6977767dcaa8aacd1a1a94880bf523bee1ed988c99878402e4896dab8a. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZFZ72565013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5832baf7976b192b6013524d9d22ff8b258efc159905c1e481fb0100fc85e455. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZDA42589695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d748c654296f64046c716e9595a4ac34f29479ed3c10a59cc8269cb9e05175. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZES82507635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3847711865adf91c642796582a2a55f51cc05a7fe3ccf6e788a51ee799422653. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZES92573623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb9e6c3cf85d065ae5428f7eb6ceb5c3a477474be5fcad998d7105b9b35be43. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZHNB2534629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5262a0a882d1530a77990fd94264ce2de593597654c29f30b658804a9984a506. 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/QZHNC2543485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebe7a13ad9a40aa7f7e5379cff8e38aeeff4ba1049772cd000b0302b98fbc6f. 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/QZK6M2591492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa22efc050906fd2fe1cfb88e94d6c35f3c38592ceaf3833fc98335e7230a57. 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/QZK6M2595328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9bc9d6e4aefb5e0a25983286c429cea75c50896395ae5fa317c9987eb86a5f. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZK6K2553727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe550e0e623f0080a069329f3d5077bb5cb0e07e434e83e45c3b7ab4b71f6670e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6J2564799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad90fc58f47a2e612d8c9f30d523225cbc83230328ce9c2421c36b8ffc4e0418. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZMER2596751.