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 0x92d8313d20a3c5bd90f2fd76264c4b5b2d84c34605b7df5216e3dbeaf705d49e. 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/a902c400-b1a7-4f1f-8917-0c950a8792be.json and https://artists.proofprofile.net/proofs/artist/a902c400-b1a7-4f1f-8917-0c950a8792be.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 0x59a41324a05eff11350fc3e89608fd804a76cb3a7b59dc367a5b9553b7ae24a5. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCADM1840722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7989b5505a8fd1a7daf3fd6bb546a425f93a340b870743f2fa778b80e46a004c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/TCADW1857325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9745caa6237bab0a158e87a2bb05f977b9dc4f812d8a725e9f361790b1255830. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAEB1959933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2254318bc9535fd9fda733e6de29d721633f4ae377f6913ef58038c7f901cf3f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAEG1998756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6b87334afed0c9b0b8bc341f2916e99b8b584f28b91b4656a803f6d695f20f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAEI1952909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ba5f2aa6755de97249f36be3434292b82af1c3942107d5c16b81a168433de9. 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/QZFZ52121083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ddf7abeb8b75ccc7080e490547b558c96bd71fc46e5c8958a08ebf4e0b8e7d. 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/QM24S2200229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f06aa28d67277d07f2da0c6a8024db0051cf17ac6ebb11067977804dbc53a28. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTAY2246226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756776a5e7749c6bddf752f509116c51bdfcd8e0b50f6d46124b888c51e5f0fa. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZFZ22345519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68195889cbf182bd180583529e3b824f975084960d527408f1ba6cf7da19f01f. 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/GX8LD2375892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c7004e172009d912c263f4c5eb834ac729b73e3b805023f3e69d9410a5b6d0. 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/GX8LD2357652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0cfc87c770544ac6db5c0b3c04e24c6f50c5a1d43adbb407137992ba3a8bc1b. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/GX8LE2379143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20111b79ed3fdf26c51728ecfca32516df9267f38e06d0402429c0085586ae84. 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/GX8LE2361988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb50f9af3ea5573f320f84e1608fc1b850d3d87f4c44fc7c907b80a8b4feef27. 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/GX8LE2377765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aefd7f30b619c6e1e555f01fb5aeee21489d3b3fdbd29708b934438993e11a0. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/CA5KR2353754.