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 0x3dd607a95f7ab271edfa8bfcb3ffc12748e7b814f3caa62de0788c21f4da504a. 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/4eb081db-6795-40bd-ad36-8ec1d05e67de.json and https://artists.proofprofile.net/proofs/artist/4eb081db-6795-40bd-ad36-8ec1d05e67de.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 0x47d82ef6b34a0eac5ff46f3e79dad6217f44e623f68c7c30c146da6fc987adb8. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/USHM82152241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252f2ead7a20c12a8d3c472911b40b3d34bf4fc89ff78faa30bc2125a35a62dd. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USHM92132601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1beeab534798a734a59b3cecef6660de1be3eaee7732debfc9a62e886e07f7. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USHM22283379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee5ede3db3304453f64e7ab1800a6e29cbbc6ebac704916c85ce9658d9d2c96. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/USHM92245237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde06cd7e45598295ad08de86d9ba524fd7e409bec5c21f33c9a2e17ca978092e. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/USCGJ2359097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517c028c8a770dfede4c8c927c9a35ac3c48f44aa9a72f181e3969f654381334. 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/USHM22387448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bca9445031b9a3a0520cdcf24a0b76605dfd489cb52780bbbe10d5e079b9e5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM82356424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3efccf2545903c53e17098b9ebcfe82a8fdab6c44dffbc030fca3ccc945825ec. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USDY42412591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ff898be30d4188d2fc45610eb8933fd22a58dfab6ff5f639e5b997f1d2f0e4. 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/USHM82450277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e52a30832a9898cd53af329e0b6fbf4443126b440ebfa573b5aad950cd27adb. 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/USHM92429179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6aa0348d23b65086bf52b1cf6daf085b1fe0169eeb2cc5fc9cd3e7b7cde60a. 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/USL4R2410751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa221b27d00aa9a90bcd0380b0ae30f199fd2900589700c00eb399d9a767eb484. 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/USL4R2423616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c359dc3b5973cff512eb17d6513b407dec2bbb61f6cadb4745aabd186234f90. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZK6Q2578078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a95fdbe2fe28b56727a54d696e3cfd8d261d62839383c1930ab4275bd028575. 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/QZZ782575393.