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 0xb4f482e0727c38b2eb8954e5bd73f86b5bcc3890335d0000766fd1caac476369. 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/a119d253-65db-43fb-8873-21453af1ce84.json and https://artists.proofprofile.net/proofs/artist/a119d253-65db-43fb-8873-21453af1ce84.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 0x2fd5c84772de0704969bb79386d554ef0d945461878a90c1d048fc7dea7f1149. 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/ES94G2102104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc767d8a2154d47d3488cd379147a2cefebd68e916d063963fb930e32dbd1531e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES94G2102105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1089597844d713a66bbc1cb3e367f994a1c34fe96d9380aaa3c5e7bcbc5aa0f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES94G2102106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931c78c4a6caeb3ba91d868a1bae991810890d5e6403d165d4f0b20add7b09e3. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/GBKQU2252618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfa539cda988cec2b443877d662920bce9fef6463eab2ea94764f9475122915. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/NLML62400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b61990be5de25585d510db61fe847af80e2e855d19e7f2a2bcae88167eee16. 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/FRPZ92408280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f73a0bc419de79637a24647d448eb310310c1398f13a165c4e2f98223fd9567. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/FRPZ92408290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9baf88ec3c3cf31cf0943ea796ce117a0290727f12c5484f23f6ac1363cbf41c. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/GBKQU2433847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cf6b90dd040b01904af6e997e871b84391791377f291f38fbd4e180dc8751f. 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/GBKQU2486703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7cc106d93a029e483e89463329e6537c625fac345e4ff96a8a82737576cc4db. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GBKQU2486704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f08c849f0ab569532341d20717134bf56c434b0fde84d66189359773e0fffa7. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/GBKQU2486705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10eb08b4ccf5b8dfa961f016064e84e36b7f7748c2da72e5d026e64aa0953006. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/NLHR22401222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad3fbc24d0fd363b852be5d203ba5f213d4ee040cc4c35f2e9ba47a6a72537d. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/NLHR22401223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff69c7334b67e16ae2c0fd0d241724eb2f56ad2a993a99efb99317969007f952. 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/GBK6Y2525801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e736994dbf197a48ecf7508707daba7aeee8984c949f4864e8e3ba8c278f22. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/GBK6Y2525802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56289ebc4f72f6fdc3eeabefdad6c14b1d990795d7d5725bb9374550b908450. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/GBK6Y2525803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027e8230f274a3fffe9dbb78fb3106b46dc31ad8be2ca44bce504091d9685926. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GBKQU2555902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6b562447d953fa06a3057c4555754b017f43a51c9cce9bce69ead870b06505. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GBKQU2574652.