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 0xd4da8ac9266e3643d322c819883a6d75609142fb2058571cbd1334d882ee1d92. 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/8caac6ef-4571-47e5-b67f-76e4aac67ffa.json and https://artists.proofprofile.net/proofs/artist/8caac6ef-4571-47e5-b67f-76e4aac67ffa.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 0xa0c1c05b79ab577f17c13be16c7c8deeb7e34880107d6db0a5c0051e8f50fc43. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZNMV2416501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f920cade841d8c8d3348937e307c5986bef83b1a819f4350167480bb13d3209. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNMV2416505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e53a8e29b00417faec9229c5ec5d40876b9734f73daed7c81f53e65b2a912a6. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZTAW2568711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e1515e5abbfca0bb987c295568620ee90f812372573d82b4556cc1fc86e46c. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTAW2568712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bab355f47f200f381757c137e596c2e9c49c83c20e10edc52dff83be7197dd. 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/QZTAW2568713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51fab1db8029f7a4afa5ef2198424b86c4fbec11b5ab224992574f2ef455f2cb. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZTAW2568714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9464f8655d104425e84935afc26b2b02c9c88f991d76eec01bf74189fe22f9. 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/QZTAW2568715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e97765ae9d1358ea58cda256b10d5a6c71992d053cc52657985bf4ac6048944. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZTAW2568716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9596c4522e93ee38a1525f38f201fcb489d61b0db3235829a2d75c61e4f5f933. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZTAW2568717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761723e189c3bcb14021043a1d8c3036bb8ecde7420a662bb462f3675fa7d5fd. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTAW2568718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4bec796562f42b75c4893730b76ec5f04c269be0d2e903aaa1834192a517aa. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTAW2568719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac7386a0f34df754a32719d7deddd45aa7f5473673762b92735e1a9a5962b63. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTAW2568720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00892e06438d29f82b0b36ef91f0715b7d6ee2537898592b89990146f7c0d74c. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZTAW2568721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab15c522a7beca50b44d6be8d07349dfacad1b572679c97206fd82c8199b725. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZS7J2507165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a59c724c06ab2109c8e8711f6105981debc0400817278af60da4dad54cffa9a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZSYP2517742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0d6ae024b53a8f8da9409c2ef4c48afe7192bcd77828da9a9b3759b2fc1875. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZSYP2594456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800850424be98832916ea5997768a51040a5518cf4548f1b97aa54687db5f4b9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZS7J2557188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3822f5e7381dbec53fcd7231662e714ce12f730d4227fad8e099679b74e86938. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZS7J2565446.