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 0x0f1c8898a8b2dae790d2928c78200b06e04827b3e1a4ed54cd51c338ecbe39d8. 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/28edd8b9-2f4d-4e51-a5dc-577b911af2e0.json and https://artists.proofprofile.net/proofs/artist/28edd8b9-2f4d-4e51-a5dc-577b911af2e0.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 0x21f95c43e0aee433c2093f4c344c59eb7473fa6809a299ac556b418285cc07b9. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CAZ700803202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb39fa5fbd61f8bd5bb8ca3723ad62a0b30822dd0e207cbdb76e9f317d789fee. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CAZ700803206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4cc86b424e8dfcc3d216f4d07a275e462e4c52c43ca734d04efc05c0acfa0ff. 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/CACEB1761583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab33ce84c22f3d90901343d8897f285738083044ec32980598cde896e5c331ca. Chain 2 (Bitcoin): anchored in block 957714 (2026-07-12T14:35:57Z), 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/CACEB1761582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c65bc992b48f4b250169f43ca482430f94132108fa659b62dafefdac5cf3fbc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CACEB1710551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1dc88336106158387d59fd17e8a4e29f32679abba8f841cd8178348fbc6cb8. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/CACEB1761580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c81b1b67b944bca39296d2faf83960ac02d23f6c005fdb4e1a766a12826a6c7. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/CACEB1756088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7897cb64336ee3749fd4fc3976539f0cf0d3509b4d033e4affe1d0d006b385e2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CACEB1756090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc621b12184ae237b36d6397df340e35b1360d1178e1a4242503eda234b8241c1. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/CAA8L1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6343685b00850818f706e6d62f447ac0bb8acf4c193ec7bf7c94a6e96ed67595. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CAA8L1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979fecdf69449cd8dd4bcfb98ce271d87aa69a76cd314bc1e0104a59d728f6a3. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/CBA2Z2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccf23aa781ca3500f9a723d06631e36c768d0f103f90be4cfe873bcde1b67fc. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/CBA2Z2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90b8e353c3cf227118268c092809e3616c2c2fb3a00812e68132aab6f4192f2. 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/CBA2Z2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfb731aedbb8cb1b82536d1505f11dd494c4dad4e5d3601cc26820c241609c3. 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/CBA2Z2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca29441771a7503112a6c685dfe5ca12d22ac2659c87111bd0a619f8dfa6a8e1. 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/CBA2Z2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71da99a64c00cbf1a32c41265cd43c3e9aa81ce9e0bd332cebabdcde9981505. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/CBA2Z2500007.