thumb|upright=1.2|Coin in the name of Rakhanch, Sogdian Afshin of the Principality of Ushrusana. Tamgha symbol on the reverse with the title and name of the ruler. Excavated in the Palace of Kala-i Ka
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 0xb4de595132e70a555962a329ba5624010b6e6c44e767b27549b0f6211f97cf24. 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/87ba20bd-9ec1-4aab-b3f6-1a4a2f2d3e3c.json and https://artists.proofprofile.net/proofs/artist/87ba20bd-9ec1-4aab-b3f6-1a4a2f2d3e3c.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 0xffeb4c6e529d1308d7228beb25603fe1ddd12ef20c9e2f59c68e5c69ac8cea8c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USTC40852845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02c00a4c446feae8468cd0990301632fddc19a16719c0380014ac58504bc1f8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USTC40854997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1815485d7f20f0d9993acac4bd0b8768fd6b5f777c8962b077cbb808daa86e. 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/USTC40855047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c2f807a555fcc1be191caaee8f1b16069db1fd5382e2c16f373b6f33337169. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USTC40855052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e68a79e48a82f96a1741b26b362204a7d575ebf76967e71352003748e0352c4. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USPUP0810139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2542626037321ca30dd3d83346766876f4bdb05814be95d1f4cc1e22d768becb. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USPUP0810159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec226019afd4f5f1e13c67c3cf956b6b85739044ac51c876dfee60241d8ea23. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/USPUP0810148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238896e297243ccb45388079f9b4c1132e541d18aa3c660fc8cf0f34096c112c. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USPUP0810149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8afe3044d8d202ca79df8e0e68fa48259486bbc5f557f19a89473a652142a63a. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USPUP0810151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd126f357ee779df3c3578d6b7235b7acba8c0853c015e4a732d728cfa2b2a8. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USPUP0810155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eae5b893d7fb81e53cd4dbd7c3b2cacbaf5e650668ff5375a45ae624aaf06c9. 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/US6R21333961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73c443f32a7e867bb368dbd4f3b9ea430cda390f0a5aa3a36a6e4f0faafb8e0. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/US6R21333962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71b152ffdf12a3cebee7d2359d4136f7f1c884ab0f90c5810123ca3cdcf9aa1. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/TCACY1792162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64d0b39aca38292524ae74727240a1b68af0331d68b95841362c33ab673cb353. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TCACY1792182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531d588b1b1ccc99c3692c43ac1fd8d2bba8f025b42362177f43de8a0ff2198c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCACY1792185.