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 0x96a8373a8f9ed1ee8a90230297907e730129c64195aa22861935e363e104e2ea. 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/d81f2fca-c90f-44c5-af3d-bf9a1c6b4e60.json and https://artists.proofprofile.net/proofs/artist/d81f2fca-c90f-44c5-af3d-bf9a1c6b4e60.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 0x8527b81c888fbb0c8f200f3bf45d3e998806a537d5bceee0c73b4035180b2936. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/US7VG1705880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f4f82a7dcf909c04d98418c35f1faa4bcd2a120b6dc690e089b85e478f28b7. 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/US7VG1769239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf316ec316d37905622b718536de4eaa93618c5950c1e34dddabf001eb09f7f78. 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/US7VG1769241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0ff8c765606e36e613a193798ab9c70840cbed9abbb4ec2a3fe2cb7b6524aa. 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/TCADP1819772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb88b0f1bc7c60be39717d023ae12e6449900322c49b1a828fe24433c83e535. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZHZ42007203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b970a68d235f00e35105d9804c04db2ce8f80327db00ce489596a3b73a76c0a. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZHZ52208994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92023c191ac2cd2d35be4e7309b227ca611fc7b077fbdcd102320ffc8509bee. 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/QZ5AB2382073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d938e8e9af215c924adc8327803dd75d29894ec62ecf76a2bb7040e5f38acd. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZW9K2330726.
Amor en la Metrópoli: Cianotipia (Re-Visitado)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a1007ac16248775200e14a121f1a420d35078adee64f4ea937a46d6dae72a4. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZNJY2485575.
Bestias de Ciudad: Cianotipia (Re-Visitado)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4964b16e2e2ce025bcb0f34b2224ada33062350fb7a3629ef123050fd6df85dd. 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/QZTVM2441348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6e4cdf0b9ab9629edc999ad488ca9160eab3a44f80c032d17aa05eb7c3848c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNJZ2580416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7276f30bc2c3c6ae41bc14ff432c17b8569c9059ed8cf72d16a965f3acf41004. 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/DEUD91668372.