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 0x53888b17597ef9c6293a27f765afdda0f98d52240e6a8fbc8d313de0b8912d44. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f13595a9-5200-40e3-835a-154b7e5cd6c6.json and https://artists.proofprofile.net/proofs/artist/f13595a9-5200-40e3-835a-154b7e5cd6c6.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 0xf3cd6e7f781ee95477d053d1961821810dcd2228085d799e49ed62979405559c. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QMFMF2023552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42ce0471287944d26f04e677eaa6280190424cc8a992072416367bf2ed3b16a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DGA0M2333097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae6181915eca6280e408d7c3ef08bb0cb8e9dc371dcd98bb73061c0be25f30e. 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/FRX282388008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa92a85ed5d952277dea540308bf1a1571275c3430fa83858df7a268afacb2c. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FRX282388009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fdcc70abfe3df7b07a95b0f0fa91b815e680ab56f44cb426eb4386f39de744. 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/FRX762337340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a03b7d268650242a30973137da1b22bfedc20a28aab64ed2620c3b67ddb8672. 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/DGA0H2300727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563e097b024c0385f499bccd8ff1116a48d5b1fef7582512270952311e070d3c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DGA082390606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5e343a222d83285b4cc49ba9a3de8d04c4a8f101a45226cd763eb93f62756a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/FR10S2514371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5e343a222d83285b4cc49ba9a3de8d04c4a8f101a45226cd763eb93f62756a. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:24:22Z), 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/FR10S2514371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265c4ab2bbbbe553030d808e445bded81eeb3afff337dc5faed43b076e476609. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR96X2519027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9bf4eb42dd8f8f9e3e49cba3920bb5a32c5aa723c4a3c3a08722296fc10612c. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/FR96X2519028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0672537ed652e5805f95eae1aaaded3efba37575c0583dafa81d435d4dbd6e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FR96X2519029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1288ffe90fb017b8bd37ebc0044384a19a5b56865a221d35d8bb0cd3e36c0e56. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/FR96X2519030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10fe1e432361b9798ccedb145885db1b2889217b23a398e30e05d9a4ac6c3de3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FR96X2519031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa867055b73d7e4e0758c09abb4479827a4ef387bc337808fce45d10b3f9efcd3. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T09:34:31Z), 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/FR96X2519032.