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 0x214bd56a38f5b56c29c0bde46b85e54fe58d57490187718a3f5553ddba629370. 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/da9918c9-5f85-4054-98fd-49ce3a2a51d3.json and https://artists.proofprofile.net/proofs/artist/da9918c9-5f85-4054-98fd-49ce3a2a51d3.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 0x7a8b2c953b750968b6526150bfbe1c04835915d434c6cd7e5f3ec833c2dd7450. 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/QM4TX1913629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862f48b7f1460d286e55e04a288a703ce2e07f0348caa52f6bed2223c6ed29eb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM4TX2056911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7164c2263bee1ae73b14f3fc295beb06bd8e2c8714ff4d9790dccff34870f217. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM7282029442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8774dc9ce0a07475a0d11c13ca85d91b9265e8f2034e85c12e0c84b3ec4b351. 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/QM4TX1913614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb36d91a42320b37dd836b54878a81b30b172d269c79ada824f4fa6f1798798. 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/QM6N21995965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99344718d64c5041e51b7ffbee25b0bb6f105ce307ead2ccd39a569655ad9cd6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM7282014891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5289ac1e472489f18ae3dbb8750508918059311e486caaec4282ef33adbc6e3. 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/QM4TX2082046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7a9703e176198bb04465dc24819d5c456a30add0fd73e8c006966302862632. 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/GBSMU5540931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa666cafc731f6183e1cffbdf50ea9049f2a2c8617573170bb0cf8d93006b94a7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMFMF2023061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75877a82d1d7848d1a89fa7442a11f5cbda3b2cd4f2a5b3c05b7a734553baa1. 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/QM7282029443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088f1e8c6b9bdcaae32f8eb91bafbcdea59c7fe58af6068edbb54b4bfd6978c4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBSMU5540907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d6fa4c8fea02b09e2bee2fb4314bdfdb506f00f3f26be594dec7f7e319553c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMFMF2023055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461f643c108f0d377ee17c313d2abc8a54665e12792976694a38aa05a036bc6f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWR2092997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3217deddbb74a014f53cfbf4dda5c4557416dc4577bd2a0b93808a3c7c8ec034. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES71G2212411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d97feaba91db524959a1d38c66871fdf49dc948dbc360d15bd870e515f5bf3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES71G2149696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96048cae15db22d23ce22b7404d8afe49d452d47ea2c6dc0e1506990017a5fea. 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/ES71G2310851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96048cae15db22d23ce22b7404d8afe49d452d47ea2c6dc0e1506990017a5fea. 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/ES71G2310851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc0434285a2a670e1615693fa15f9f70172ce9ca617389a3d981c3c4f7ea4d4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM4TW2230706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7264e4b3ad7315a2374287adf6cd075ff9bd1aaf278365cea1c4d3a79cdf467d. 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/QM7281914432.