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 0x5d5c7b964251eac986b6184aaff5336643dfcfdcd7bb7690a85791dca6ece873. 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/50d5c5b9-5882-45a4-8dcb-7781df737240.json and https://artists.proofprofile.net/proofs/artist/50d5c5b9-5882-45a4-8dcb-7781df737240.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 0x02df944114434e03db84201459f33b739c14c7db943457abc86c6ff52afa9ec9. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ZA4PM2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa521e71f2561126f6abe1a5e996ba66868d6a8d34fba5bf8d7864ff195842e55. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/ZA4PM2100373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca7aaaf47eddc27c4657cf65d58d377e9d637607c449c4a4ba84160686eecc5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ZA4PM2100374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387c2f325dcd15f5bfffc26224383fe26bae78782861877414b85e2bff2a29c4. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/ZA4PM2100375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af778af291161996194d35dd2690c02b61cc6882211ac54c00e454fea28bdcf. 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/ZAQ652302689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a619628b9313976fab61596d53f3f629ceeeaaad4928cbab4fdffeb3e58484. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:48:21Z), 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/ZA4PM2300810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2bac5bb71ef202830a04636a054bfd2f7cafab4a1b1a9b2c794c669d89f29fd. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T18:24:43Z), 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/ZAC012401801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cddf1d09386fbf1afcb56ed151be691e71cd66fd126b3725c34848a2d8f635. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ZAC012401802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cb620f541b4257d6013d7c89cf8dbcb792fe8834e5afd9cf1635e2f488a55c. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/ZAC012401804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf53daeac2d339feaa1c1ca2f97138e2de3c85b6973e9260a1d16106b1aedccb. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ZAC012500594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa610590d2fa23af3e006d9a1211baf217d6463e67f17bae268f489c54b152142. 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/ZAC012500846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939c8e883adace5d2cd0a483dbd4960fe952897e7091ed25cf3c8756b993c2f7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ZAC012500910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b44e31cc778993ee51254168be7d15a3e267abaada185da038bb75b3bc74b4. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ZAC012500997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4cee7e4159a69c02078f1a3848a301f8bd2080e0680c1696a02f5a6311e3aa. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ZAC012501200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04466d1e05f356db86e05ba746da206e58e1af942e8e467675a114ffdf035c78. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ZAC012501201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31acb77c04893f0c54807e1be0cf13c1f75c97780d35e55b37b6a9df4db4afc. 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/ZA4PM2000101.