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 0xc2cc5823ac5d06ebb2c996323d83c6079e13bb8340478a7b779884c5b29aae5d. 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/3c441f10-cb1e-4518-a1ce-62418541991e.json and https://artists.proofprofile.net/proofs/artist/3c441f10-cb1e-4518-a1ce-62418541991e.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 0x4c46e6caf0e14c4b40daf072c2e4f43ce490d7bc223823c4c2433fbf6fd8e7d1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/GRS018700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20683bb52da2bec0666647d8c2dba253c835c7854e09c577406081e398962731. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/GRL018100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a81b5583f8cc6da54f9dd4bb35da5ac1b52ccb1584806d4ddef21a6bd466f9. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/GRL018100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778428f8be45094e7f365962a1d32ee0e26ba1b169a4284ce5bdc624e377dbe7. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/GRL018100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a057683ee61c39b8b855630b86738a8a34c8a7ead0f96b92ec90e607526af5. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/GRL018100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b64a22a6c0020677f8d967601685eb8de569ef457267f2dcb90e797b9836b93. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/GRL018100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1974c26274cd2197dac8d3d2d7c710bb08784c2e275f650d046cf10e973a18a6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GRL019600065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe437c6866ff2fbb39fdb883d3c9dfdd7ed6751bc513609e3f46206df92938fca. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/GRL019600071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb404fbde17f06e444e3506e46f8d8dc61ce132b3cc9e383378d3b59832c61708. 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/GRL018600025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6adac73792a630a78129ec4bed6410106f9fe05bfe0c6fbffd2f019adf2cdf3. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/GRL010700291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c46e6caf0e14c4b40daf072c2e4f43ce490d7bc223823c4c2433fbf6fd8e7d1. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/GRS018700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46696097c91ce4d0f85b7eee77fdcc212e9801f29e44697bade7e56023469ad8. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/GRL018100034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f218761cc58abee3aed77943bd344ed38d88d770f576468ef367e59b1ea80d. 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/GRUM72401206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc463b72f5231827c5cf5eb6e014c59b1c1ec75d2833ef2cbbed9e63db7abdf8. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USA561069326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6d53759497ff3419af141c5b781c209a8c3649637587f9eb5ebfa692b77a4e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GRL010700294.