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 0xb96882cea318a2ae4217bf60febc7ffadfb780e6df752766833912903d4bb744. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f27e1f0d-2159-4995-8c19-66cf742fe8d8.json and https://artists.proofprofile.net/proofs/artist/f27e1f0d-2159-4995-8c19-66cf742fe8d8.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 0xd9f3eae895d3939997b64729322a5b23d8e020b70dae15a9e73e343f1865168d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZZ772403307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca98c8568599ed37dc34a8ad4ffa27c34c813d6ed305c28de6bce560175b9ae. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZFZ22552847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a3933ffae4d4a56f93e77226b892e49a86cadf5cdef0550c462536a9e086f2. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZHN42558080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf61d031c6eebc01fbb2e072b6da17b1b07cc879a544f2ac1e5826e9865b11ee. 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/QZK6Q2530064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe638bf05a8e9f9259d37ee146f4c94b58151a085743e1f3c57fdd07abbfb5ec6. 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/QZTAY2535229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14ea0497fd654622bf5c6bd10f08407e91e432752a4f6b4657bb21c82fb58c0. 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/QZTAY2535230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dca5dfe352493835b51fefab08f0cda1133d9fcb131e3b1635a934661a69dde. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZTAY2535231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd15f90c3ebdebc5c93c2831ffd5ec5d6fca72bf842d4b91e8be2c2f3f9c65ab. 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/QZTAY2535232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aafda42bff9280ef40c9bd784f95325ef6a068935e82764ee83019b64d3a7ac. 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/QZTAY2535233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe360b1160c8402049b264bf40de5f99fc6686c44a4ece19c4c71ac41f2e25476. 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/QZTAY2535234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6529503fdad4846601f229adbe465b3eb32430d0744eb4878c1fb35103f41e7. 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/QZTAY2535235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebac931ffa5b82c28b7946050dcc9cdc16008101375f6fb51b371bf1cbb455f0. 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/QZTAY2535236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18011d868b7727bdff4a009963ac89d85faa1a1c97bdbceafe6246886f2a244. 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/QZTAY2535237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc84ee3a7bc333c980bd8b3708a08153cd2acc1a3a3025ad62ae8722e406d367. 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/QZTAY2535238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16537bb518bc471ac253361cad2adcb62cf5f771fdfed6a850c7052985da851c. 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/QZTAY2535241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424afdf94f69da662fc09a245513ce9e8afc31e271862badeb02127d73e48296. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTAY2535243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cee5b7f265191b3c164fd8878c853905353c325ce9f4e9c84ef1ce25de8b289. 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/QZTAY2535248.