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 0x9e1d347d2b214b30e9ff8be602ce0b8cacacf9a22e8c18915701ff40793e7f08. 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/3df9d5d5-709e-46ac-aea1-2cb666bba7d3.json and https://artists.proofprofile.net/proofs/artist/3df9d5d5-709e-46ac-aea1-2cb666bba7d3.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 0x199133cf13b640b2140676f19dacef95e18b2b2dd001ee364cee38bbee0fdea1. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:30:04Z), 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/QZES82329285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6489d146aa1b2e960001ce652a3cfe1a6c3136c175f0fe67e1b823278a922a42. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZK6N2303511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43915d6e2a28c09d9842b315674014a594de6d1fff888de7f12d5fa3fcd3776b. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZPLR2330193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ab4c2177b07134f1ae8d764ba7228afc50d1b2c74b912fd5dfb40de0ccfacd. 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/QZTB62345184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f513a34beabb345889ec8cb4b66d239081eb1507e34d43dfa26878a127d965. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZTBD2347475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db688d03104c430a8929cd108bd7090f344cfb7d763e468288433bb6bd98a27. 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/QZWFM2341261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6f061500ec8cbe44598e8df9ecf96b81ec4d53ff51850b74d764ffdaab20b2. 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/QZFYZ2407333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9d77a73fb9f272de4e3ca9ff4b25151c04ebc12871c39b0c82acad666ae6c3. 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/QZK6F2428996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9213199b09cd280b8a7c3241785c12efa64d7c1afa9a8b03fbf7ee71b6368c7f. 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/QZMEM2453944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9d77a73fb9f272de4e3ca9ff4b25151c04ebc12871c39b0c82acad666ae6c3. 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/QZK6F2428996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9213199b09cd280b8a7c3241785c12efa64d7c1afa9a8b03fbf7ee71b6368c7f. 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/QZMEM2453944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0823f22b8a549762dcae140a7f5e8e8dc34e5420c206848eb919068fb56305c0. 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/QZNWU2456560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c0655f7a546c5f51461bed15e7664bf8c6bb6fd2e909b0546d15dd58c0acaa. 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/QZNWU2456561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6415812202c6c3959db1bfc04c6ee9a2435b894f5769d781c904d614a2b6ea6c. 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/QZNWU2456562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32abb8a9c501e318b82350b1356e28c342fbb2d573a5b94053c63af9bfd214d1. 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/QZNWU2456563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ae8e85c3c0fc0bde33a3e910c9bc14d7332eb161ca30a24050fb29a0993da7. 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/CZUM72400524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd978e0aaf4389c0cc21672f8a7fd9e4ecd43184f1c60680d1c83ede440054d63. 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/CZUM72400525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1073036073964ffb943520317f50659a2bd93184062fd56fb6e99dddb9647c47. 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/CZUM72400526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132a3a7b1adb9585f827b92b09a3022eca9c9cbda83847e684edea6deb0df5c0. 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/CZUM72400527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a8c0eb00684fc9ecf4b5e2dc7d495e3fce8084f220feeb08d0dc3e12af0000. 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/CZUM72400451.