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 0x7e2f663c2b364119ccba24171fd5c98a1e766337859290237976df54752330e2. 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/90209972-c560-457d-b885-c78e94b931a8.json and https://artists.proofprofile.net/proofs/artist/90209972-c560-457d-b885-c78e94b931a8.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 0xb637b8e36506d3ed10daf9df54bc6da4c84554445fe9868125fe49e3d01cec97. 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/TRCLU2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8919dd9396f39a997854e833d704df91a4acb074e6ae6621a330c0b96c1bb8f9. 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/TRCLU2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d8991d620882d04b4c9f8c3ce1d5d39da29980d8db5acbebfa0bf584af72af. 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/TRCLU2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa710bb53d026701869965cad90ec4a03011599952166c4a17bc6eaae47928ab0. 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/TRCLU2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfaa7f6e9220a2170c3ad3b2415ac2f446c663f885a25f646de87ccb81ff10ca. 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/TRCLU2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfaa7f6e9220a2170c3ad3b2415ac2f446c663f885a25f646de87ccb81ff10ca. 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/TRCLU2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9a02389a000e422a99012e46b27cfa0eb85a9c480a6a17986b99b17847b72a. 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/SE5752403611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95b8afdd89f3023a1f3a37ae67b6594bc11a27231fce46dbca2cc553de2ee62. 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/QZGLS2488569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f8a2b5e8b15ee045bd0438114f5aa639b0dd47a930ba6faa2408c0832469d3. 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/QZGLS2488570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08a54144000402f4c9f4c23f501913c287bfe5d61ecd2f7079203a761edc749. 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/SE5BU2461590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d372339eebc680e82adade8399b92ae8a22d8b6e67b2c2de3486d1fa05bfd9. 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/SE6QE2411446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8ac34ebf73ee31098873b15da11e1ea98b36e0c6b1885d6aa689dc4bae896a. 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/SE6I32368703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c117d92853f001e1b908ed2d9fcb1ffce2f9a453f54955d4429dabba0a0d86. 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/SE5752305340.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a81fa51fcfb364841b40d3ba3eeca81262f0b7300397c437b20e373a3377091. 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/GBKQU2308822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b7c49440099ad68a8b77a8459ab5c60fc79f7b1e2503af8cc426f9a51084ce. 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/GBLV62032342.