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 0xafe0e4da0b3bcd73013088fd5b212cecc864772a2f120d429bdfe744ca0f075b. 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/ddf4d27f-66c8-45e8-8c64-f1e0f24b61a9.json and https://artists.proofprofile.net/proofs/artist/ddf4d27f-66c8-45e8-8c64-f1e0f24b61a9.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 0x6b374a11b7355f613a5a32b92883281b9707e125688502bba3d8570e7f221f18. 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/QZNWP2350497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6051acec8ebab329ac1f6c3d58843bc1184fe7e21698c944796aca879c6a9a01. 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/QZNWP2350414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9749befdb2e02206bb2ff4bf7177722ff1cc6e7e93027e97733fb1ea20a45069. 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/QZNWP2250242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc03812e38e9854873b01790f900cb7312a7133f5e09308f08a47c8791e1ce3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM87M2006412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f01062d3759fc4a85d7deb0d108047bcef7a770817092a6cfe17fb2c53f1200. 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/QM87M2006415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edb940aefe3da48996d61100c5347492d403fa3d1398583d761fdfde715f730. 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/QM87M2006418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00f23134ef0ca3110c255e84137270162825011830b11a22e940604f45e9736. 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/QM87M2006422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd278c9dec67494251f1635a6715c981460331ca4318f3053d0213fcc5c0ec08. 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/TCAEH1994458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750d87dddad88601128f7dab4f1cdcb48f0e044f22756bd36452977979494aed. 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/TCADO1883904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072dd5799b5cf7c98de0945bddc5eaa54285833b8ca2779e0a03e90adffff2c1. 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/TCACC1483992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6828f18564bdd254965baf5ce7e51604b5d6ceda8f82181e829ee38c8f7bf2e. 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/TCACC1483998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ff77d4f332e5e25af900f21feeb7c3c823d5bd22de63ece8da2eea3b5ba4a6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCACC1484001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d46b8cc040b44780ebc12954d3448bebbc8176800024161e1a7504487ffe4e. 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/TCACC1484006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76332f28a3959fcf1d28c183d3a83a37f3a6a6b8adee04c34fa5f06bc34d9f5b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCACC1484005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6051acec8ebab329ac1f6c3d58843bc1184fe7e21698c944796aca879c6a9a01. 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/QZNWP2350414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ffef31c65838e5f4836ab9b32db15e62e2ca95104174d6c4c2e81c49dd3a64. 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/QZNWP2150013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21a71039bea15b1070f5529eef27c6698f922910845b17d894a445fe26a1b6d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCACH1523561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7514c570f91cb3fbfac69bddf078e395d195e84648aad460fa3c679b5d92cd57. 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/TCACH1523562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a700a0f92c36a6a52dee68ff0f07a2287cb6d252721d41571923e098af5ceb1. 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/TCACH1523564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b4ff61d52d2cf62529ba48cda79c5dd946cbc6817326c120db66e6a438cb0d. 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/TCABT1450910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc44199e67ef0e3b91339b182f2618797605854047ba825f9203556172e6c01c. 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/TCABT1450912.