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 0x4427c3162510ccf6455d6227cc83e35d1f733d206382b640e23b5290c4dc5fa6. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f7de8db-bf6b-42a6-8a9f-048eee0e78a2.json and https://artists.proofprofile.net/proofs/artist/1f7de8db-bf6b-42a6-8a9f-048eee0e78a2.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 0x6ff76c6671b099908a02904cffbb6a31828b3466a2a3ec5f9c822715717c0867. 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/GBJX32378043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac5500e88c0826f4f9ef9e07d38037017833f90a5331f0839e6acf70316ea74. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBJX32378044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fb0ddd8f63e822e801a5648227855620c90cf958795fdbbcd11c2848908ae5. 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/CA5KR2304382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5076c428d766356c6223779ef44ade0e675a99a7563f4ddb02349bf2fae2480d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA5KR2304383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c9a2ee8789cf184c24119b642f8b140224aa28ba77beb889e7b17d032645c4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA5KR0018645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf31c2cf7feb666b406f7c23d2d957d6bbd844748549ca5eacd64d8de366d6f. 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/GBKQU2466482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb93ab17a6f4157dc06f295ac5b4e454782e61af215b5d30b0aa825e7d926bb4. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBKQU2320383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8471ef21b606acc3472984d67e02aed32214b61dc7049a2627554302f9ecda. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBJX32278036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef2c5c8fcb2951895015d59980c85dc234b9a2ceae64192d81ca160ef55a562. 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/GBKQU2280517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb774865c0d87f6056a1f6c904ef500ef6683d2e4c0114d54f7416c31bcbd49. 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/GBKQU2260777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc13ed50b9f406504b0e793a63da8e2a5a2ca053f03b434ec08d894918ff2eb. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBKQU2204586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3cd5168d4206449631ef66e8303525787d62585e2adada7e2711253c64220f. 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/GBKQU2203442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374843438c51a6c722b63c7ea229988538bde8486e5e7248bb8e1b8a7aab4256. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/AUXN22186868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3a56e5eca980651456e4dc6c1ac1d6061762853c54e539d4604a9e3e5f24d0. 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/AUDCB1701725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d010e55100ee2a8cf9df164b6f161d3e2594fb6ae3d64d84f83761310ea6c5. 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/CA5KR2148844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691203587e3887f61d52dbe964b7f47510e9124c73c50e8b75c2f564f0307986. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZHN32058547.