thumb|Cosmonaut Sergey Kud-Sverchkov practices using the TORU equipment in the Zvezda module on the International Space Station TORU (Tele-robotically Operated Rendezvous Unit, ) is a manual docking
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 0x90f863f72b715105761f05f3354fc01311950d8385add6e66fcb204b4c718ea5. 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/0aa196d6-fa72-49a6-b76d-b6b593e6e753.json and https://artists.proofprofile.net/proofs/artist/0aa196d6-fa72-49a6-b76d-b6b593e6e753.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 0x2eaced4fdf50b116949157c23ce6250d8cd7e0fab7c0fea133973d724e3e3b7c. 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/TCAFC2065130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c85267e02137daed9334deafed13e30bc5bf276233b826e7e27fa5751e2f7e. 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/TCAFN2137305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb76c94e60f7bc341a832de32a906d609927e8dd8e6a34934c7010b9f9192b4aa. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/TCAFR2124922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f02a680b5599ed7af9eb7497529be6a334b91bba9d39a4f7a36876c83302df. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/TCAFU2175480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79cf1a341b97276d72da7170dee13365a19b91494c231dd8e85959e36303464e. 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/TCAFX2193586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d78756abd4514a4d40113c813c05d7db458d51cd825057610e4aafb5394af47. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCAGD2269171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b489f7ba3ea1f106aa6d256185855ef7921a6e34b9c4bd18f0e78796aa1452. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/TCAHB2321932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c7f495c0d91c578eddc38432a3f5e305a547fb0b06fe7232f60c25492ae848. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/TCAHC2309846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a8b7883dc54951a43838d393b1d2c79e60dbc7ec64d7ea4de29ef86a8bc1a7. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAHF2314858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89145f53db1cb85cace3e67971c96eb7a57abf5b50b31ddb5778d05c3f571ab. 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/TCAJR2584089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bc3dd2b1bf5513a2def432cc6ed91c12849f9c6dbd43da16aff63e488f6230. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/TCAJQ2584244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4276271bd1586b9621909d5370989a784b4672f323464166545876ebcaef697. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/TCAJQ2584276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5680435d869af1d48423392dc18d890b963f57d5cf571feef0f83ca4205333d9. 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/TCAJQ2584316.