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 0x32dc5779b34740bafc6eb030eed999e33825eb02b4aad2ef808bcba53e9ad33f. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5febb2ff-c183-4b18-beda-afc641d87ab1.json and https://artists.proofprofile.net/proofs/artist/5febb2ff-c183-4b18-beda-afc641d87ab1.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 0x424f9d18f8505354d15c020912417a6017cc0ad11bb0821e2d8cee7857bb6464. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZAPG1738311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872b355470dbd8f7f0ba458a8c2d2d7575b5242a86b70394b0ce66d37b8e2e2b. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QM4DW1853067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f7c4f5c44ff043f280ae816be174666804d95d118ddf567d9e964bde8f7350. 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/QZCE61892295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afbf105a688d2ecf8a7f884990019d7f6329298375d72481903a49aef95e3a5. 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/QZB4J1823572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3accc111d56116f13de87b26c738d8c1d1329be0e940ca891e756a72c154de. 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/QZB4J1849995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6c1412b9f54b30720e46b352ff6e2da02dbe89bc62f7af29d95a4737f08613. 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/QZDA51858787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fa65b3bd78ccd30703a2c50e4b9c99d2f1c5da5a35f9fb3c2f2c0085cf18c0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZDA51858788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ede4b1db0d700b510080b71df85c13e0049af5882e4ae2f8d0b6beddb5ef731. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QM42K1811891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195e552d44728b019d94345badffba2d01ac1dfba754b3f062f8f3135b8f49cd. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZDA51858789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc554074c5f07f5635ba35e94da8b2547d5455a93ef3d1505e1ae856fc14a63c. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZK6K2113374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64d0c25ff91bfe57ea27f48545f6b999335839bdc47bf882e6e62e46d202d9e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWX2199414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca663c829be834e2d718169fcf09b5198c7dae9b5f3e6da363b19343dcd83fe. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZNWX2199416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1546144b69518621d1ce259861d4522c4b5fcbf61a3e21f81a80c5c53aa6cd08. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZNWX2199418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4200a9aa61bdbb803d835d4026a528b09d0e43a6c2657b32098a2c98b6c21dba. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZNWT2193324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e93de99a4ffef8d606fd5e9fd28ccc8ee651cfb34af171f55ee6792ebb3d4e. 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/QZFZ72142557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166ced6cd6f7f3c44b00be19c4e90852b85c8e1eb924a25e89f99a60e40047d3. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZNWX2199419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5327c8c6e793dd01b7a90d7d829f80bf55e752773ba9e54774a784d6cd1238. 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/QZNWW2320259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f7c4f5c44ff043f280ae816be174666804d95d118ddf567d9e964bde8f7350. 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/QZCE61892295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bba12a43e58f170a34fce0102ee3436f3703f64326797fd8948b252c15e82c8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4DW1852444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0876151f34130a5d6757f8f94c4015fcbb21493739a9066f1ea7ea8ae97d05. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES8741903124.