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 0xd6517f3258e80608614f32e80380a2b96529bf10ea6641feef7753e619ef321b. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1c62de5-c0ac-4db2-9df2-4063b9e590c7.json and https://artists.proofprofile.net/proofs/artist/f1c62de5-c0ac-4db2-9df2-4063b9e590c7.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 0x397b9995bb2aac10bc1ec54541bf7eadd6e7e391e271928453a5efcf6ed3e8e3. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZTB62545936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4153e05d5e35c4311128c0a75d14dd7a49d5ed702e42801db33470016a1b8786. 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/QZTB62547440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc195f1bbe7c40dc786a000f76b97b4b6eca60e5eb9f473e77fc17d69b6b869b. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTB62593757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf96a09ea549547df0ab2c995394179fba7f22c40fec7a278c83266904ec5aa. 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/QZTB62592056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f688830269e74f1a81f499078f7e84d80d8f8b1dc756ddb08d352fe01af725. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZTB82583725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef3474b506c1b68a8b0e0998eb722fb5d682f73c6061b7db70dcae121174976. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZTB82581560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c28ca45fb9d03efe71917b4a4de6af00f6d9a9fed4a48a5dabd91e7338f50f. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/QZTB92544820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02b391c3744e9380babf51fe620620669373661de5f1bd947b80740d00f947a. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZTBD2519889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c3f2dad976a41f105c27b47921d97277704fc453f8abc92bc84afcaa63b139. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZTBD2517474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b660863e54d72a9df010c724aa9399f94ad069239e0ebff2113adb4dbc09ff. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZWFE2547994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b13e758fb62dde7e4548b951ac50867ddf0c071340c76a4bbf8b7cf366ae03. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWFG2571136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa95a84f1ed7d2a51b240e614ebd0dbb60e4eca68776d85b5dcffc868feed635. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZWFN2591892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8459b547ac15433619b79fa9854a14ede196211bbb60a8cc1c0d1ab65921ef95. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7U2570705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89a20c1652d3be28ef003767aa17d6e62e34cc22fbb2a841b392a28e73e6de9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3F82515910.