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 0xa24cc817464bf92a7827cb61a1cfb1daf52a6161aea16abd835bf15b81e9a6a9. 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/4d8baf3d-f036-4bba-8175-3d8bd0051dbf.json and https://artists.proofprofile.net/proofs/artist/4d8baf3d-f036-4bba-8175-3d8bd0051dbf.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 0xdc327887db30e0388643de02edc8d0b0baf787170501bc8f87d6a6d2e4ca21f9. 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/NLDP10800288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fd9a8896ce0b01ec0f632802b428ec89d9e953ca3dfb4909de52e194926871. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLDP10800281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c781f4932b3b534a9d0ea64e373c28f1662b4ef98dbbdf37912285044a8c4d. 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/NLDP10800291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4ed08174a95124b4885a593ac589b6f057c54e6dfa13812c83a01949cc5ddc. 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/NLDP10800294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10fff8ee0fe7a4fd429e1f899025772185550f0033e9beb92b10fdf5d64be1c0. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZTB62419431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4143c22efe128967fa8736bcb871ca44ec8d5e6370c88ca076bb9f9cc57aa8. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:01:15Z), 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/QZWFP2470718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80af51958b159391de6c0b25f08d2e920ddf8cecdf3dc89d32eeb460ffbb206c. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USCGJ1794764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371bffa517b72dfd91487d68bc515e1f8caf6af56e21dc2f592ecafd7024f9d8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCGJ1794770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4e56f32e0716e3f91d98f3d3652e000b9502dc7ceac3a4014e69565e00a85a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USL4Q1992233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60798c7e13cf3e8926c4af8210b90ca43f1355e07c6f9777398faf9f55dc4220. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ7L2487875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eeec49bee303ba77dea9eae4182c1b6671ad471a6256f95e2c9a25a81d16dbf. 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/QT3EZ2438172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29fd8af5b9b9053580542f4c7b06ccd8be0bf0d9cbab546e1f72ee2919c9bb9. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QT3EZ2438174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc428aec6133832da7d47ad77bba7b42d1f8cb6424f2c2b660a6490c84751f9e3. 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/QT3EZ2438176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4143c22efe128967fa8736bcb871ca44ec8d5e6370c88ca076bb9f9cc57aa8. 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/QZWFP2470718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d658d63982ee881ff6a0f178bb91bd8d59e075ffa10936d0c3a22d2301b457. 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/QZMER2546770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3deb3c6d34d5985bd655f5a4c4b16cf2af8bbcbe173608424464b14b92705fe4. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:27:06Z), 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/QZWFH2328497.