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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3bad8caf2813bc594750e6555e3e8cd353cb192ce1fe4c35205765505ca5a6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/982fae2e-4be5-4085-a4a0-ae14e3ca1b7c.json and https://artists.proofprofile.net/proofs/artist/982fae2e-4be5-4085-a4a0-ae14e3ca1b7c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01229262df656c71d90849b76f4d2ee69930196062254d8652476e3423f146f1. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:48:32Z), 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/NLA028000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995b00953e1fcd2c5739ea65908b0215ff10e3a302208800e7e10e787bd7e34d. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:01:25Z), 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/NLA028000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091ef52908005353935a3ccbe5bd42e69a63768fda3e699d9e7086f8cd1837d0. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:36:37Z), 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/NLA028000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c2c562aef9c573f36be60d5b08989cd2d280fc3477ac24975e0b6ae2561ba8. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NLA028000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc635a7d0343e18f834ea19016d2307f8b1d8854322d276f5460dace83039f029. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/GBUM71601962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6dd79a01166a28bafddbbce18c24fd78b048a0499bbb7e7cbbadbe907ac9e4e. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-17T02:59:41Z), 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/GBUM71602013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f4ce54eadcf0ab32beee83a8b04467485bb0810b4bbca7a543ac7da8afd8db4. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/GBUM71601966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd53146f3f27a2da3ddb4270d9e011b9a114442a2379d637af770bac4726f09. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/GBUM71602027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a7eccd4c44ff422d0a3305696a2127975aecccce15b4e8131ba376f55b35fb. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/GBUM71602028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42bcc6f6afadd2167a3cac9a49dcbf9ee872272ce95f58b2261c8b8f9a857eb. 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/GBUM71602017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88bc3fe9a4eee574e054f0f6a5e8d14fbf440025d0b5423c178536b7791f2ed. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBUM71602054.
The Friends Of Mister Cairo (Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf817d8fcb7b8d9b620426ff8663f4d3898c9bc6129f43ea26e0d7b2ce5c7f1. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/GBUM71602011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe471ad9b008278228407adecf8451f40b7b927f4c155bce953b5df77b0ffeaa1. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/GBUM71601957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f37b5a9875c8bf6567819cd19e16af07e50a0e1f3f2f1874bb52958d5fa39f. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GBUM71601994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170483456aef18563f2e566a668bf1c35b359907aec947e8934be106963b96b0. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/GBUM71601971.