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 0x8f972deda431da5393d0d9bb1142595363ddb952d3968fc4e5051ea0faa571f0. 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/08ed994e-6331-4597-9108-a6d203eb3f3d.json and https://artists.proofprofile.net/proofs/artist/08ed994e-6331-4597-9108-a6d203eb3f3d.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 0x5c3bf9111ca80988815a33014b4ceb5410219a98921e8f84de76960a55782ad4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZES91802209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc8166f008980a0f102496056a214e9d25af80874bc6b03657a2910b21b0375. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZDA71952365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11aad396452c2ae2ef163c7dbf9cc194db0073a425a540e5a5d65129afcb0c28. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZHN61922882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcf572ab81d5b7e35211ae431d18fa379b0e152d0ff9be5e60788eb1ff0fc55. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN61922884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9386a0d362b9cc46759dd2fd868682d54845b09422db5ecaf3ff2b211b294202. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZHN61922885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc7cbdd3a3d8b4afcad8187b9b31e14572792ad2edc0e9e00463e132c02dc3c. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZHN61922886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd23ad0fa71ca7af8dcdbb42b4648985fb62fa24a4e9038ecba3b531ddaeda94. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FRX202072894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f739fafb676d09d1a289299bd4571e5447b31566018d042edcf0416395ee1a. 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/FR2X42291861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1171a1da1e0f0c5bd84eb0bce0b6aa3dcd5cadee21f9b48972d50919ff80dbdb. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FRX202286648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc727df83928e9584bfb3df1cb40f8509c7d04864ab6db3499e08eda75c95f4f0. 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/FRX202321357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85187b0af9cd554f80449b64f4d5696b724b1ccece8e4a2100c4aeba78c7a9c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ITA642400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc702e0f3e34eca2d4b96c106ed6c7265611de0a28c4f29143762d9e0b2a42bdb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ITA642400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc702e0f3e34eca2d4b96c106ed6c7265611de0a28c4f29143762d9e0b2a42bdb. 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/ITA642400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddb5fe7061ae72c27e97455b6bd78b4e42a5f26c651549b248402933147d09e. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/ITA642400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4259a0230353e91a3fd68590bfc4ab61afb5d758639f1005c2e8144226ac07d0. 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/ITA642400053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd754b1bafad58570fd0d7f1945f9c57516f11dc80084bbcf6b829607db6747fc. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/ITA642400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43b555002af7821b8a007bb6d1550f4b16580d7b23f9ccc8d7c060bd94a24a9. 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/IT1O72100777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e28ec88926d0ff5a5a76bc002ad0403e1419bf751975522316383f58a5d4b49. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZDA52423601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6260873d7f5a20f7630993c11775c33f1ce76b79d0cbe70fad04dfd43001c77. 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/ITUEK2000095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29c323eda33a8793ca64658d5ee76329fc73868938b6cbbdec9c02b0d78d8c0. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QM6P42020376.