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 0xe106a04ef8ee2ff3b22f632111fc2d15e4ab1a76dd40b641552bb656d52fba04. 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/b3005384-59af-4939-87ba-fbd140470363.json and https://artists.proofprofile.net/proofs/artist/b3005384-59af-4939-87ba-fbd140470363.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 0xef600d7abd79dcafa8f188867390a458bd9dee5f41916c4113bdd3d3db093770. 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/HKG732417252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6617577b4a91b5aaa06cf5b288289add65ae2e63eaf3dffe661d01d6cd73e23. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG732417253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03223eb7c820e48c2d741685ea27b0eb77c7361f09c611ccf4994095b79142ad. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732417254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50767cfef12aa2e3b8071c7470241331e85d37acc37ee5eddc2f6d1fa25fa650. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG732417255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda38cecbcddcd4e34fb874910465470cc5bb74fc1e0c48434f6b8ce2ef522efb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKG732417256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d101d8d18e341843267bfabe43a01a65cd6cded9c017bd356eac6b57eaa01ca. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/HKG732417259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a741bf5c157afd99d07109d6c893aff5a222f488e817363d976d2d78a1848fa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM4TX2027721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa547357b9c00b2bedb8e39b144e98785961d071e5064031784726aba1912fa. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QM4TX2025612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bb23132f4b5b4afce96357d78b9d4870d86f08819383a08e354d7f2dfb56c7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM4TX2025671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a22a3105bb5e69079e73cee8c8bb33b6fca500e7c43bed0faef42a45671bb5a. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QM4TX2022213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb811acbb80bc5085661654839398a4f381a7011c0723885ae4372a4ce81aa5c6. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/HKG731857908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d06f0fc46d334210923b84fde9ea7315f5db641a0b7ae4f05423b46f9176f2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732133212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc3732185ecdd65302f06897bd57bac7ceb4f9d28c069c8c191b17ab4519d16. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/HKG732318287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b627f78a1d1b12e4c8352e9bda6a3f4490a07fb84a57d262f7e12d7d3caf5b8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG732133206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187c9182332e06a7d10788d8f4b787f9f0a9ea3a5908f7bc6d4164e2ffff5c36. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRX201971371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a042cab2c19569de871ca0fdfe968140eb82cbe3711fbdfc57a9dee18d4158. 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/FR10S1901184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3eb936060fbefb288598db7056927f28a04006eccff2110df29b8567de955b5. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/FR2X42188248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98e702139836affb64cfc6272bea7cd7545130fb625e45dde17dafd3875cfd2. 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/FR2X41961113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c3a60455443ba060dfdcd50634d307852c24fed499c24bf758c72732080a62. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732417334.