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 0xafa18d7ad94fd2f60d31d0d1dedb80b75e23200d6aa946112182ae7aba20f8d8. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8b358f1-faa9-482b-a0d7-9a595aa9d7a3.json and https://artists.proofprofile.net/proofs/artist/b8b358f1-faa9-482b-a0d7-9a595aa9d7a3.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 0x93a82ded325691834744e95f44b527d2a602b638b968b7d713f4a40417158ce0. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZDA82505099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3729efe4a8f267cbcbac50fba52960efe0cf5a90ba5df4e7730993fcb27430. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZDA82505100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c52386b76944aa23d732d11dfac9881055ea61bd4131b855621aedc85a4a31. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZDA82505101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26beaa54f845c2ca9bfc323987028455f7fc1bda6374a84868b0734cd0fcf0d6. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZDA82505103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9612225199d461d400b4995f0daaba34148edba200e010727d2317cfcbb3e991. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZDA82505104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546dc94ca9d2fcabf0cae121a2955891342c9fcd0c4e464a6f41c2992a890294. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZDA82505105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a450abe73bfde2114dbdce2fe8460d643b8ae57f8a40a151b22a7771e87c47. 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/QZDA82505106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1444b0ee1b83e51a7cfb2be09fcb99b651be871c7f44477ffb0a6832cfa8aabd. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZDA82505107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a079caf5103dc073fba40a2b7db18c814ad2db9b6603393c087ca8ef462fe81. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZDA82505108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b5cdb35543114a64683d186601ccbe0d9ed2059bae464921d225c6286a29f3. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZDA82505109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a664f28af7dd7d4b6bfe595d7fdf100b670305f1e0ebaef8a21bfc36dc589e. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZDA82505110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2663e6ee836bf8cb04e42dcea8f2d76f1cbe66f46018a930b6ca212f715d1932. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZDA82505111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ca6adc8b52de4dba61ea60d0f4d631600d445f817df6e6de60a1d08129c54e. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZDA82505112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ad77ddbf4ebbaf74d8ee40e44edb0086c16ae3b16518d2bd1d334e49eee42c. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZDA82505113.