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 0x293b12ecec2231f49dc7f2ebef0c8541bacd40f61979335da2fc7839af48bf28. 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/3380eb16-3db9-4ff6-a7df-d15cb722e09b.json and https://artists.proofprofile.net/proofs/artist/3380eb16-3db9-4ff6-a7df-d15cb722e09b.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 0x56c129a86acdf9908271ef57b4c099d32d4ed621f5566cf528c04dc248067cdb. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZWFS2316178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6400ffd647957225d030d64e9aec6c6bebdde78f619fb1d7c7317fc8a910ce8a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZWFP2333557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccb0d7d364ef193d4b3347e9b9d5929ce7746075bf8ff69668047edd2654bd2. 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/GB8KE2325388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaea0b2f0d44c18215ee9a49c4861eb7f567e635fd3a96e9435d1f0de666e52e. 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/GB8KE2325378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbedf15425dcb2b8fc2c0732d8ef961568bee1e5110864648fed67f02532772a3. 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/QZTB82391844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c40c50c77c14b3efa256c6577b85556364ddfe1fef491e5fe6faea3859dcd80. 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/QZTB82391845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a8a554c592164ad018bad67daa2c52b71c01edbcb3db43b8c5c35d1d105507. 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/QZTB82391846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e468bd44990e7f278b0b88c9efb42589a4d8dd23a8112daf5ed18a5f5742fe. 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/GB8KE2320503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098720a565ce7666ce4d6f5078bbc8842644e12fb97f49221676235d0b584547. 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/GB8KE2321954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d28797facb306228c7188bc97d7f4595492205ffa9c59fc22cdc8daea475abf. 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/QM24S2308805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36efe2c52ecfb78b1fbe4d3b2967667ab1c4af21937d16d0119e59899106c459. 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/QM24S2308804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8340ae14795d0877d53ab21e098a2c446d012a993f1b966f049da0a485433a7. 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/QM24S2308803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a224f884515eff5ea7696f0dacb93d9bb53a4be756620b5b98e85f6c1a4fbd5. 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/QM24S2308802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e1ce0fcd9faccabd8481e6f3ebdcaab1f6f020e27665f347daaa9d112a4e8a. 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/QM24S2308801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806b54344ac7607da2ec41d5df6d774efb183cd5492717746714f41f0a86a6b2. 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/QZTBF2371429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f2765d51314d07b54318eb3bb3a94345a5ec84551928a4b6f10b9cc36c7d28. 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/QZTBF2371430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff293f1d5e5f2e6c812fefb01f55139755bbe2c71d0c4081497e80550298d461. 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/QZTBF2371431.