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 0x70fa32740b98e2a6187ceda62e3606036166877025ae5db5d9119e7b526c0525. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44e18f39-cbeb-4d94-ab32-7947a015a8d0.json and https://artists.proofprofile.net/proofs/artist/44e18f39-cbeb-4d94-ab32-7947a015a8d0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Roots of Strings: A Musical Journey with the Arabic Oud
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 0x9357583ed8fe3d1a7ff5c10a68c439e46349bbb7f28f072a1665eabfeb7f8c3c. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/CALC42020511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07332572db5238fc4f1edb7000bc28eb3b5da171f0bbb8c3404f9178c961e4c6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CALC42020513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc577940f0225a21bfa92e36f023001c86937e5fb77f60ad69d4868efaefb629c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CALC42020514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63eae570099afb6b89a22316ea0cc66954280cda87371dd1bcaf853af43ef3d8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CALC42020515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5785c200ecdca909084416da285e291cd664c1ac4f375790d04da4f7273e6a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CALC42020516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076abf01cb2d649e6e189f38249d5b702e5b77e0823f15ba22e41ec874ecf3cc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CALC42020517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ed514d3c5f2d2f7b60c6bb4a72189c116f135457be5d15153ec748e780088d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CALC42020518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49a58bf1f24e326d67f53cb247d54707c1a9c700b708a59ac5d0dc93ef74c5c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CALC42020520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a5374c03e5e89a4be515c73daaf216c99eefe2962f904a655f3300243dc5df. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CALC42020521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62cc20feb505550e27777f08a13b3d6c62e955438c558b98b52c028bf946606b. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CALXG1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0d02d762c104efb90ca497a991731dcc34a4b16090fa70501e32786b5bb6df. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CALXG1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc093b159d6a4fbecd4e629df416c6cb1221fef7ab383fd2612922d90bb95723a. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/CAMDT1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f350d8ed071d076db0e25c5c342d9dec9df08c428a67d90db1d0a24fae7e612. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/CAELL1700002.