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 0xaeba808f3c844eb82b221c0f5fecc66db52f831286effa736ce8e4a5ca2a0347. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/78e83e9a-4a47-4105-ade9-0b4c6e456273.json and https://artists.proofprofile.net/proofs/artist/78e83e9a-4a47-4105-ade9-0b4c6e456273.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 0x8893c719ba352a999357997c523477ca1347576c3dff4ee2be69cc5c315f4661. 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/QZNMW2359354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb0d1ac425ce90461f60d47844f38ae89f5a95059d2ba21d753f18f1b0b3e29. 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/QZNMU2374272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf89ad07d81ee7c5e95d17603eddc9dd1bc4689a0e281417052c5471997d1ab8. 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/QZNMW2331946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38185e193411a4981a72b4d186f7ea838e8fda82656750e416b0c2aa6c46b0cb. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZLL92460840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90c9293545c8acb1407b100625ede227fb649e0b71eb80d77169a80c1abe500. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZMEV2404490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc98fb622f4eb510ed99bb016ea29043f251e8c35f3b70f546282a1ae9387cd. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6K2486423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f597c5ea5abab1222b5f6107d319d0ab048444ecb668275889c4e545972fe0. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZNMU2471446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f3445e24b9856b9495708bf516af8a0407d1881d2ee65398afefc6b918dcfa. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QZNMW2428499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc577cac1c208c0a69dc570f3ae63cbf0794b773fa8a9e142e91012c8eed61f57. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZNMX2479358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aa18fdcde43afc4bf8f86cdfd34721ca1a9759566e516e45ac085ba0c4840c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZFZ42515999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aa18fdcde43afc4bf8f86cdfd34721ca1a9759566e516e45ac085ba0c4840c. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZFZ42515999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a1642f80a73bbcf810950465272ef688d3666a341fd64cd9b8bece81bb2d51. 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/QZFZ42516003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf1057afbd1586186dde09c027096a47b26d0edae8c779a870f73c15da7061e. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZFZ42516006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c271a1c562e92e7e6356341f4d47bf262afe6172632b2bb8b68eafa43efe05f. 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/QZMEV2573931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680f1a431f796eadb1ee58a98b9475fae31bee6983d197bf547e8fef7593c927. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZNMU2567285.