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 0x42ee15755223a7bc3763d44686708240be49e5c3a13eaf410d8a210c4a5c5149. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6c6b446c-aeb4-4cef-baae-de1324b23601.json and https://artists.proofprofile.net/proofs/artist/6c6b446c-aeb4-4cef-baae-de1324b23601.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 0xeffaf70565655a4e22984f309a9a27b7622547353a7636cb36b08634fb31fc04. 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/QZMHP2408091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25eeab381f88d306744cb5f3092716d23cbf9d81a5f053e5407554743fd409f. 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/QZS662482359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cda87c4f46566e4e4b33e793e4b813135e5928e7a4efcc74858f110e677332. 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/QM42K2472583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807e4feece5582c257b17d0dbde268b0e08558cb4ad87cddee9b6e4ef57c4cf5. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZS632475293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62826c936871e9088f014ad19df6d1d43706dc1753d2eaf48f9157ca54cb55ef. 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/QZMHN2416498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5623e971e7ec65ca46963c276a75e282060bc3627e96f626965b31d4af3b5a29. 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/QZS632466605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d5ee3c02009cb01c7929d41ca1508ba6837e4c2d7412682893642905d095d2. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QM42K2433251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4337d70482ead5b6fd90d8d6c10291cd30ebed73f568da099a13a708d3f013b5. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QM42K2446671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16aa8f67ba0cfbe45fdb876712dd31cb98e25275c9feda3603f5972ee84db669. 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/QZMHM2402051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d74172fb1ec246bbe74a4dbb3873e7470dc73d9fce5dfefe2b23497ff62571. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZMHL2342431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a8c4357dee626046a3daf91fefd8cd653e3611ee5d9e0bd97b897a1457986e. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/QZMHK2393039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972cccc5b9a06792f9157ff3a060f4fa976e4a972c34b26ebf88ba26bb04fc10. 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/QM42K2394955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae621f12afc3a3bc83bebd94559d52ab00cd3196a0baf83a8c9c9224b09ea4c. 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/QZS652182386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2d50d2a4dda424d28f5e998ffd66cfd63f1a7c729a6e9df13d6dcc4235e453. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZS642147953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa884026447befb316a25e9cc71b02c7046be43fae38e80fc12d381dc4252ad1f. 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/QZS632166420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ce510140440c3ad52a4688795150eea37845b4d5a5dc81e1daf431f38b7dc1. 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/QZS632120962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5089203966d6b67f62bcdc0d7db5e7358ebbecf6de90bbb2e35a1063c243815f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZS632127774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c6b484f9d2f07918ea1a7f9ff69545c24e835efc74b20c4d941abe8375dd93. 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/QZS672149400.