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 0x19a662c5aa9c90ca9308b2a98519270b7cee8916eea627eed820915f6deb2169. 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/86811db9-fdc5-4412-aa59-dc8b99056c43.json and https://artists.proofprofile.net/proofs/artist/86811db9-fdc5-4412-aa59-dc8b99056c43.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 0x287190715966b6f0b84a816f79ba6d84203a6d02373167760c4d7f533cc7c11b. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/DGA0Q2346940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34952d696b91b2a1a24f6bfa127260eca214bf999674f0f115d73827dfaaeac4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRX202442351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c61c6cfdcf35c3b2de93ae04e248fb40b1de17111753b604c9c7e62c51db83. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DGA082470528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1bf2b687f363b795dd0dc16ce4a3be01fcae9f64dab56ad22d30b47d16bae9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DGA0M2405938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8113c342d0e3d5b8f6e234be35b86a69e5166d4b0fe536ec07711f65774f2d8b. 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/DGA0P2463023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73201a9f6533e2ec33d79d9cbb2bd32b247d156a6ed46c73f013f3ab7e77aa77. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DGA0P2463024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a462cd617cc43bcc3ce5afc2da9a9d6f6fcdad15accbf973301f7a482e60327. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA0T2420780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28be671a318b459603100f778e6f0b7e6c8493f2d52637fedded6dedf96de0c. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/DGA0T2420781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2121984956b1e61dfa84e98e510ae2fbdaf26f1bd388372e38a5f789fbc1dd83. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FR59R2508765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232a1c76b285f7e1a9b77710c39bd57c6de3c70663d760f6aa403ecf59e5c722. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/FR59R2508766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab3f608626dd16b77c7f98a88af28676ece61a28d90327a0263e9606b7ce7d0. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/FRX202539562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e274f73c7bf41c2095d5b4aac53c8ef9b99c8343a8caeb89f972621d7d9e336. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/FRX872521748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0664a964f3d4263079b48ca968c702a1e51939fc82761a60b41bf3c7249d09f3. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/FRX872569060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e83cb0939ceb253c002a5f07c1861060128a5ddc51c9745afe82d08c5aad13. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DGA052514005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc5cc6535232f0d66acbb77943866ae24de8872ccc415ee33240909dfc9cc51. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/DGA052582551.