Cassin may refer to: People Surname Barbara Cassin (born 1947), French writer and philosopher Brian Cassin (born 1967), British businessman Elena Cassin (1909-2011), Italian then French assyriolo
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 0x33265050774472673690e9f35c43ed841998f5dae03afcecac94b0ece3e012e0. 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/0b6fbcca-643d-4356-ae7a-65dd978dc357.json and https://artists.proofprofile.net/proofs/artist/0b6fbcca-643d-4356-ae7a-65dd978dc357.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 0x5b85bb62c0ff602f0db9daa7cc9e050484ee345ee60deb564b294e7fdde57a83. 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/QZW9M2292290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491d22af664f972419830992fe3e67ed38c14d2897df3b5bdfe1d17a3b7f4b21. 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/QZTRX2444145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe020918366a9e4cb89a0503bf129803579fa6bc3cf75e10d3cd9d852625c83c3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWDE2412908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56ed737a361199f45aabc7588a7f89c5ff215acc6f408ac982945b71a21bff3. 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/QZZEC2457848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8a5eb1ed68f610891dab5dbebbf725574859fb35052cd3ea3793a1249250da. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BKB8A2500045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013e75eaf68c1a0e9ff94d9a3c6ea02c2988fb6c16155638bfeb73a122a01cf8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZWDD2488629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6beb6da89263d5b4d518835822622cb924f73c9302060d47e27457ccb0874fa7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWDD2488713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218e858fa827049054e64ddde919b5101ee80bbd7fb5a15a5f05bd647a75934b. 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/QZZEB2424902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134986464194acaf25f7c75b7e91d9e81159c5a289f3175e856b631d9553a875. 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/USLZJ2453237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6341e860e27fe6e531d2b443e4fe3104b6119f0b5af907ec1272bc5f3b9fa46a. 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/USLZJ2453269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4bdee951697b055276b02eba603bf72847974242815be4b7af585b0617fb3c. 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/BKL742400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6341e860e27fe6e531d2b443e4fe3104b6119f0b5af907ec1272bc5f3b9fa46a. 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/USLZJ2453269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9738698890053e457e5f9f4582bad0a4c88eeddde9ffc88d41f9593fe1542f3f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BCY5N2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6beb6da89263d5b4d518835822622cb924f73c9302060d47e27457ccb0874fa7. 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/QZWDD2488713.