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 0xff394683c0f993d90dc1e7c98d103c3f09007cd4b87ee543f6c7d291b2fd2c91. 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/4746698e-9f63-488f-abdd-3731e577b269.json and https://artists.proofprofile.net/proofs/artist/4746698e-9f63-488f-abdd-3731e577b269.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 0xa7eeeede32c4ef32bcabb6a680adfb895bb28328e40a011657a94dc4a2eb27e7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNWU2210309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47a7147a39ad8b1f9c1d5ea58dfa89e2ab8aaf1676a79e33cbd2c743b589d9c. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QZTB92287912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea259c21cae2f4c89d7b791006a5db7ca94db536e685094029f19101853bfff. 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/QZHN42340883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28928bcf7157da30d1d26c5433b052830584ce0d97c3238b0de511119bb0cf9. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZDA42409565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517ea25a1426e1f215427707f89963f39503731e5a92415c79e2e87b91c9c2be. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZES62409261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709ea079cf7b39bdba643ac6546139a654b9871f3676ef0d5b3932f63b7f0c13. 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/QZDA42409571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe486fe97c29f1d0835f5b65975b78cc7789457ed990e9a1e5bb1328db8d99f0d. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZK6Q2459888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d447e5f38cb6683f133d93554e9cf9cd0a9587ab38af73da930d00272657de4. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZNWW2457778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390d54671b5f9b81a0fde581da228224138140539f4f590808c156e361257e75. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZTAW2432360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6d7456dc3bf29f7028cca7958101737be96b160936d065a1bc137ad608327d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZZ762453706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cdced8502f8af3a0b92247e1d1824ab4031d18525ff92acd4e6f33749ab322. 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/QZZ762453707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b895e36b189a0b29ae16e2ca1e4d6a547e31035d60063e17c516ad78ea80e7. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZZ762453708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e854aaeed25faf355860d2bea98891b14433fca6b2ae881aee7d85688bed37. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZTBC2415588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189db17e8c2bc3322a84f37a3b9f628f5a5608e5b9941f4aee7cf44cda7f728e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6N2576684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cce0ab1155bfbd0d6e66fbe6af55b75144e1702ac226807afadea7cf1391962. 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/QZK6N2578926.