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 0x2f0d8508b3b5fba4122ea7b34e14f5e8f0ef31de9ec56c53027e0783f95f72ef. 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/ad6bfaca-90bf-48f4-8d89-c3df0746d1b9.json and https://artists.proofprofile.net/proofs/artist/ad6bfaca-90bf-48f4-8d89-c3df0746d1b9.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 0x6a57a9a436b6bc5c14a220a75855a451946f972de65e25b7ad6a2b25a46a8576. 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/USA2P1952082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8643a410029bd0d08c1b67b0fd57c57637d219de08485638eb284b0150f03834. 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/USA2P1931528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594dabb55c96c362d7af5a8e2e4116f12ef66882f6d6c22bc64ee1c557cf42ab. 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/USA2P1921815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c4354ed8747f97b27112e9edf1b7e8d7935ff9ccd236bcdba10cc0f0e823f4. 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/USA2P1817063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8304752e677de3336e21b247c3fb94bf426d7224b6a2c19e5e96d787436f10b6. 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/USA2P1802285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e09c112dd1b513db268f47807f74992440e5b154fb3514833ec90d05cd4d46. 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/USQY51793271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f076484ae3f16c58bece95cbec8d2d84ba3fec1bc37fadc4da873a7ab67608. 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/USQY51793395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75c8e9ebcc3c8905e5367b3e7e5ffe8c67f4a1c80cce10320277f6b61688581. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-21T08:42:44Z), 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/USQY51798836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8456815d8c62f209aef07d1c1e3dcaae724a18bc237f39481e7d7395a607f68e. 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/NOZ7F1604001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2330c0d83113dee1db0ba8fb356e81f72fa2742877f74a10a30d1cff17a4b08. 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/NOZ7F1604002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb563ce3eca83896001811e4159a2cc2c428b5077ea88d1b2cf3f9e5b4523123d. 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/NOZ7F1604003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5a8481f3fc38098942bd8d80dbf022b58c7bf8514f8e07df3b1c7860c9a0ba. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T17:02:56Z), 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/NOZ7F1604004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bb47a051b2034ab409c24d1d31a4a83e5bb01f2a9b25b6be781077d38da615. 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/NOZ7F1604005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825d827094bb38edbb76ae9192fed3fce66d06dfbc3b09dfd77047467d005f55. 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/NOZ7F1604007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d488ee67d38f0789940ec1be8a3b722d88a93f244de53ce458d4112a03e4d3b. 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/NOZ7F1604008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ee24ec2f8c8968db7d51a79640245eebfdb95aa15944ec7c676c408bc54700. 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/NOZ7F1604010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6f2e058c2962c60a0752a8aa3b3008bcd2da328a9ef60f69d2d393b6cfbc7c. 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/NOZ7F1604011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878e1ce51b45144602738aaed230194ee87cd30c66e9dbf3d090e57c7fabd0a0. 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/NOZ7F1604018.