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 0xdd54574d9c192b6cd014fb6483057731c40f04375b263ba3412a41cc412aa824. 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/577ead8e-9403-40a8-990a-02621ac3db19.json and https://artists.proofprofile.net/proofs/artist/577ead8e-9403-40a8-990a-02621ac3db19.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 0xfcae016c3772c8e47700732ffc788c7a7948e3f98cce70177887d4b20f82ead2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAGI2234387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4791a2abcce06a5a03a6604516d89ab7acc97268038f54737de869b6fabc99. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAGJ2231345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d152313b45cc734278ece362bce84bee2f4e84909b9c0f0b1c533d4dd62c57. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAGK2218327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d152313b45cc734278ece362bce84bee2f4e84909b9c0f0b1c533d4dd62c57. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/TCAGK2218327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa5f16f7f6175313c30d05a0f5fd2d5f18c6f00e827d97856f7c73aabb6c244. 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/TCAGM2243892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa5f16f7f6175313c30d05a0f5fd2d5f18c6f00e827d97856f7c73aabb6c244. 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/TCAGM2243892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fd5dbf57ff3b4f1802822619fc7c996336fde3e9ead735fb11758388cc90e1. 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/TCAGO2217592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a0cea5753a4647985510c6b523460eb78e5eb847a87519a1a7751f42efed88. 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/TCAGP2213960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a0cea5753a4647985510c6b523460eb78e5eb847a87519a1a7751f42efed88. 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/TCAGP2213960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76c08ab9bd2032c0e91446f153894337ef4f3d389977226e371fb76fb2aed928. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/QZTB42225241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578034dbdadcabce82ad1c7cda7704a95b78a33baf6faf12ac7ff66eb0281f8d. 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/QZTB42262832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578034dbdadcabce82ad1c7cda7704a95b78a33baf6faf12ac7ff66eb0281f8d. 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/QZTB42262832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4ac3aa27844702907995811ff796aadaa8e51398633b046ac717586016b7b7. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZES62378594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822b63d64dd7277948b75b77b90942200b4f70b41ad891d93ffdb6d695bf410b. 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/QZHNB2326878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ac24849ab341c37f842e2be9f68f5fa2a717be07a328b6dc864691f502cd03. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCAHC2342791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc7dd41d66ee092a540f193db8cd183d3e9cf79efc3de3548008cf8646221bb. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6H2348391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06de5f3951b79f8d030ad41a3ccfd165be25814344a1efa0aa5409ba3aba9fd1. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZTAX2324438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133a0f51d4a60e301e9ee629d19f1551faa88b8f321a2f86a11121d547becb2d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZWFH2329696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0dfab9d066060da91d4b22d31df4b0c04d90bd33c6e44b3e1d47c8742488baa. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAIC2442853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279ab45c71e40f3ea6363e6d42c606241af7347207626da82f4fd4c48c9c0d19. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHNB2493320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d1ba61c933bfcdbdbb3e9ced065b259ba1aa702ed07cf671b32671bb9b10e6. 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/QZNWS2432738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95e8a5b240632cabf4b418fac33b71389372bea9c0e7505a9f8dff2f3cb6fef. 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/UKZGC2504955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e22050718cf4997c852c813925462a31531fb7ee1ddeb2ebd8539284cc00c3. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/UKZGC2507038.