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 0xc677e65dfd5628b71a0b056a2a25149c2e86b8639532481a1c910176a2748c07. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0bde884b-e592-471b-8fdd-d8ce771bfe5d.json and https://artists.proofprofile.net/proofs/artist/0bde884b-e592-471b-8fdd-d8ce771bfe5d.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 0xf0e25d85a1266d9c5d5d881518bd2ba00bc360472e59be4c20270667805df2dd. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZFZ72356675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ec49f6e3f4ffbaff24ea92b1129a175e5d5e06cd8795bbc139daf5428f4633. 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/QZK6J2347562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199044242a9ce11449c964a7a7a11b9f61dc963a82e18bb67b1b389a28e99b67. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZNWR2315664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfd1c2e0294b34030cca3d96d228ad8c9b1ee0ebf4c1fbc1c9361ba93512256. 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/QZTBD2329813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfd1c2e0294b34030cca3d96d228ad8c9b1ee0ebf4c1fbc1c9361ba93512256. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTBD2329813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ede45a3171f56065e7310d19148b55aa9c63377abb90c4ff169f83647acc21. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/QZK6F2452459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca574fceda44ef38968acf3258716e336a22e7fd3e4a73b2ad6b0698c2e8105. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZWFQ2464472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a780862ff64884b6d3b7b46db8fcbada2ca91ae4a775c60b9572a4baf0c0a3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZZ7L2403188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a780862ff64884b6d3b7b46db8fcbada2ca91ae4a775c60b9572a4baf0c0a3. 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/QZZ7L2403188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68fd82987859f7eb7f2255f8c27a203150095551f7797fd50982b90ff61790a. 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/QZZ7P2462290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68fd82987859f7eb7f2255f8c27a203150095551f7797fd50982b90ff61790a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZZ7P2462290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc17f5d61379287b0159b9f0181332988a75491942ac9c6e25044e066a645b4. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZHN82561248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14372bbbdf7fcd0af0c9d3735a65c6128fc789d55fe28aadbe8b4161a1c73a2. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEN2582669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11b36a50d7f1251a7e52f44abacacaeeb6a93b6cc395b08f94cd3f187613d02. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB82556808.