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 0x2b199ffeb6edf5cf995825c5d8e6762340f5696f7eefb7cb05b728d92757506e. 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/44c96d87-b439-4cb1-b7d1-dc7d2491c16e.json and https://artists.proofprofile.net/proofs/artist/44c96d87-b439-4cb1-b7d1-dc7d2491c16e.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 0x9249216a2ae0e92d471d56ae97c66711aa799e8d1efa2ccf644f3e5ff61de5a4. 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/USHM91383998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068b1df43b33c88ae26a2131bf1953019dfe1c73486ec0cea12ae65b2acdca88. 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/USHM91383999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad062b3962e67693a1d99348ce25852b9754dad4a6f1acf000abfee8440d554. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/USHM91384005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6aac972aac252af32e713eb6bfe0264364cb4ab0478ab107665ffb2c0c4d82. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USHM81635531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4a9640160f6b549f76cb57d00812e341db1b59a4e2ba61e6498ae7126e59dc. 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/USHM81635537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1413c6e2c6734d500a95362e9599e80c0d64dbbb11a7b14981259babb93d1163. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USHM81635538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1c20610a14c94a92ac7849fc56c3857346821769f74ee9d627486cfc3e959a. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/USHM81635540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0551638bd4e15573592724682a9219d00e6699bbfb38c8efe8b1693f897abff6. 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/USDY42089701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e4d42f7e3e99fc4cbe208fddbac4af5863bd716b666e7a239a476c854d3adf. 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/TCAFP2196834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40df34f2c62a895e2d626245fee7aafbeb60e47c0d1dd9652e502e5db9acfee9. 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/USDY42089702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfce2baf30836da3a438822cd2d4c5cc58e8e9a0edb6002c0d1bafd0e1e6750. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USJPG2100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4415c7cfd33bb6ea6c6225b59c366a34e491d51dc1fff7ab5fbdd39f199aa615. 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/USHM81953417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116e35465940a35a772b47ce55da75d28a4238d8985ac9adb1372f6c9896e05b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZMEV2352879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d98ac136e4b642c2b543c8c3d68e3a56ff728e36bbcaea793f15754b76cf88a. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZNMT2462310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf232f09c7d6ae66613250854681a919a9a0246344a782d9769cb12a61c0ae6. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZMWW2506278.