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 0x1334ce71bfb6c389d62a7e9c3476287dfe8ed9810ed392c8c8bd8d8698304ea9. 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/ff02c3be-0449-4972-aa6f-60df29241fe8.json and https://artists.proofprofile.net/proofs/artist/ff02c3be-0449-4972-aa6f-60df29241fe8.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 0xf4978ffc4b8a4b056714eeaf3769b65c831f5fb346193cb636cd80ba83936c68. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ32491853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085ba47653d95a12e1bf44e5285e90c04f2fc5f8dc527f3a4bad0bdb779d0120. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB22355085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921e6e290bce29746c660bd475f507e15128b5be2f70028655cf3016ed590375. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZFZ32491854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb537e5847fd85804ad1e3a3c1260f0943fa5fb146788d4dfa3f2cda46ec6029. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZWFP2378223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc51afbaea4701615cebaf27b2b7ae603ce9efca0257b6861f6cec39bb31286. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZFZ32491855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d89238003e9d1c79563b59713369f27da62fe2c9525f924d7efda53a9ef91d. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZFZ32491857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a2afe2fb9d7273751d2e755de9ce1ed944e45aee4b4130d569a6807f3db55e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN92378410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57cf047c3cbf4fab45fe937f96826db9b715cb5de484df7a05dbe3bd07316dc. 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/QZFZ32491858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51a9bd8a130d4ddeec2b93e5e4503c17cc3474888ea3e608ab11f8f6382d080. 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/UKXN22407019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3d6ebbe4cf62c2afde1d322ed25c0892e8ce4fca6717e601e01f42503302cc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBLFP2419859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b21d5873cf23d6a6165a889e329eb68157c489d5bc5cdc533848186ee1e87bc. 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/UKXN22435419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb537e5847fd85804ad1e3a3c1260f0943fa5fb146788d4dfa3f2cda46ec6029. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZWFP2378223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085ba47653d95a12e1bf44e5285e90c04f2fc5f8dc527f3a4bad0bdb779d0120. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZTB22355085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a562206eec150904828d05e969fd2565c524f5b4ac79a4b2c9299f80fe49509. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6G2491576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee9ebd557cf6bfb55c8d3b645f5f011fefda3f4fff92efb0f4112aee3736c7f. 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/QZDA62456714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228dfc7330cf7e648e1a70de8d37f1b38697a7f7f182dafed1344b88a7966c6c. 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/QZTAY2278456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20ca59a4ce3fbcf17515f5b3124a976deb6fef733a3eae2a45a6165e4576d3d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTAX2466532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb09b593688717790bb8e0c9f35915c5973d41d3c43809683bee0790c3818af. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTAX2468202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d033bed223675e86565ca0511bfaedec79bd7b49ffc1bd1075b469818592ab5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFYZ2404126.