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 0x0e783e10395e4b01532c6a86dc5c558996150753c75fa1f516fccaaea281a526. 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/40201545-1276-4288-9361-676cc922c909.json and https://artists.proofprofile.net/proofs/artist/40201545-1276-4288-9361-676cc922c909.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 0x087d5d9b10182c87a75dd1e36feeca641c3aab95f63143b5d90a45662d89c838. 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/FI5ST1600064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde49f168235607256543993ddff03cc893da0fb2728c92402b39d623a14f3c51. 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/FI5ST1600029.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471834ab423b6b9d71506ed25115a1ba399027c77d30d9623648ac3901636e0d. 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/FI5ST1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092b29499683c9258526b5f823ca142dadefcdbf0bf21e4fdc845a33b07f3455. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/FI5ST1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346a6a9bb5bbe5d87a17cc1e376bbbb6e8055fd07a5bdf307974fc0585b4b864. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FI5ST2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c10c9031cc59b6ffe1911344011aba40ba877f84ce3ef3f332291cc5d3ed48f. 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/FI5ST2200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ac69f3ed4cc8f215718e5c6ba67f30c6bf75c823a3bab34dee2dff0e9b95da. 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/QZTB42366686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c06e2dfc9cb10d0544c83ad1cac46d9bb5d5d8fe847dc21e236c49b3461472. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZFZ22326801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c683d1822c5c302af7547a61d4f00161beaf7e5d2e9bcadd4a87688adbcc5d7. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTB42366687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47443292e91fccfa5e4fbb2a2bebc84babe62fb970170dc1c52343df6e75a544. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZTB42366688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5156ba73fc31bf541858e81a9e4698850b3b556e75e637891be6c77dedbc89f. 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/QZTB42366689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3630490c6a1e25136a2c1e74aa4d4943610db2e7664bc16d11bec4d585c32cd. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZTB42366690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043ece0140cfc728fbfce0a584449ebcc57b865c853c10cd6baca9dc6c51ea49. 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/QZTB42366691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf595d52a7b36b6e4f565b531ac5116e38d6d04c4d08d81b9990df23b6f378a. 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/QZTB42366692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03acb8dac39c65665676375cc898d9d7ad6590a37e901c84b00070e01d5ef26b. 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/QZTB42366693.