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 0x9fa0a169d28b80723da3ecf1c0e824bbc08c5da0259378e6767b975f70f4a2f1. 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/ef3eb912-b46d-4995-9380-8bb25eb560b0.json and https://artists.proofprofile.net/proofs/artist/ef3eb912-b46d-4995-9380-8bb25eb560b0.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 0x0e9d89eed712d90ec26281deeef8afa3eec76b7653b7edf388ff72e71d2ce36a. 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/QZNWW2128277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ef562b3210fd2b9e27d7e47263efc0215b9b2e3e3fb1534d2c0ba62b61ec4b. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTAT2141569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f5cc2eff4d06528d40245f8d994cc77502cac8b256f705c0d89e3cb515ef39. 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/QZHN72228244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593230b5694e6075e1765637ca5b1837a877f57a1a3dbb645167ebba04f41cc0. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZHN82272583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5203fc1adc0fbc3023a9437396aac5dcd3c90a88d911022f659f41034761ec22. 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/QZK6M2299559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2790beb0dc28c2394844c7c49bbed1099f0108718d74a577960bbb89ed834b3a. 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/QZK6G2257036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43ae6c3155983a900d052a763e762b29cae5c28ad5fd3fb5ecd1f420d1edd4d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZMEP2281621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbcd6044b60eff2f6baa6255ff30a3e90d3139260f910a98c113e3a4097c4e6. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZNWV2215420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6269fd7835cecc630871fd135933d5033c327cae9b753534bd052bf2513ffe6d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZRP42234077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77069107045b79d1680ba9671ac9ac16a8334519f0d89ec89d1a3515d2ee8d4e. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QZTB32236228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac051aea1537d6a38c30e102e84c713e187c902c9b2d6ac4943222bb3e52a4e4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTB52209761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95901e0c05c57218dd4a95b47a7f399132353c378766271ee2565023ed1a9218. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTB82295019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a72f6cfd054450ff71fe16f00acdc2598093fdef017777b6231f918a67563bf. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZES52347320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef85c6b474c24706e2ef90fae2571be3b8704391b88f3a0f0ae25732f40e77b3. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QZK6J2215231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29431f95ec863e3c8d203cae0eb7a91ce4adaec1ac4d95c65c98160db9af81a1. 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/QZVEM2357250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1dfed73fe955978ef5b9c0fbb539c0a5f7b98a4def5b61e475c75e015fda4d0. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZVEM2364821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1288c17934dde9ad8c28626a0bc044e65c57fe75efa7757556d0ea9c17fc2358. 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/QZVEM2369298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9377183ebede43ac6c992c1d4f7a9a57a2e0d675f1c55ef622bc084de3ecdd5f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZVEM2375182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e894d51d34ed5a695ac7e2dcc421700a8a34e8daf3eff9dca59332f752c4e18. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZPEW2433563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73cd182ae5d1b3b91c1d5da5931cae9a75ddf8d968884fcf49c70ae4f78db7a. 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/TLVEM2403642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3349c18dd6341a4137b16b0c22e0b3611c2209038d50b73290d8037d00c74d96. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TLVEM2403643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9687c61636dd7a4b9a4b1fa92ec611892edd51569af074832c952f2ed186f3e1. 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/TLVEM2403644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef85c6b474c24706e2ef90fae2571be3b8704391b88f3a0f0ae25732f40e77b3. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZK6J2215231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64994a4877723f975779453d8d12a584d242336ad48dcca228537e2cc835706. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZVEM2354899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b76482c09c910b4352c7a4f086f908f603d52ab0ed6d78b54471bf563f7f47. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZPEW2542257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c7ef8c7be92d211c66b7991dc57b1f0bbc872ac03a7b0856ad32743916938d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHNA2504633.