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 0xa6e5f43d5c08c1927c79cd86bc566d987e9d1f6f04c6ee8f1add2114a769a601. 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/27ced8fa-2250-47cc-b6c3-0748852307c4.json and https://artists.proofprofile.net/proofs/artist/27ced8fa-2250-47cc-b6c3-0748852307c4.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 0xb2931f13257e974fe7ddc6c12c60177de7387a27bae13ed8f5dba385e5c081f1. 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/CAH680700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46f1aba319ba7b24dae2ed7e2e94d83cabd052d6e881e7c1f8a836142714c71. 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/CAH680700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab8e840c93c9b96250bf84150d0ad62c72c57bf30289936d9a414f4da846251. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAH681000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369a44237812df0cd40e0743442316fc6034ecdc0bddf65212d6e34a82d2d7b8. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CAH681000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff47ea1f0d4763cc002ce06cca5d88c3f0d851724837de784dd702fd61a1e8c. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/CAH681000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb90d4f7808f64ae8546c7b735ba00d60c07dd39e73c319ad99e3c48e6d4842b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAH681000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8c9129e3e5334004187c611c35df82c03d2ebe40afb9ffbebf2b5611789434. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/CAH681410009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed70643f88c174a408f2c63b1680b1efa3d55ab5e36ab947f7a3d72e93c7ea84. 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/CAH681410010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb305b2f170642b329ef4b17fb9e5ea3f935f33298aedf51eab356aea2f3dd67c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CAH681410012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23f1106a62fd6c8a3ac5943e069749b342c8c8a54c8cac6d8a78c2cf947870c. 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/CAQRB2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f134d3fc19d8968a7aa73a84b6392788c8bfa4bca20d2399c444fbd6b4d0c80. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CAQRB2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6933517ae8b513350eb0f3837d28f99da4da7c7ff6ad58b419c212337746a725. 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/CAQRB2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4410fb8dddb8f9e979dbac63bc77a7681b4a89c806654b507e0b9fefe1cd96d0. 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/CAQRB2400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0323f48c3eb8bbad2c104c03e0629e88d44d948eb5f89637cf556a1f21e6923a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CAQRB2400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4374928ac8b7f792ffa6cb0352a988594b361be8d1d4676fe26fdd6f342f0447. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/CAT560856015.