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 0x5aa3e643300917a12d616c0694f971f18d0994db4907ea19f6a6d56abc730bff. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a7de79c-cae3-486c-a7de-c69b1e6e90d4.json and https://artists.proofprofile.net/proofs/artist/4a7de79c-cae3-486c-a7de-c69b1e6e90d4.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 0x67ff4c13ce39f97a76c80a881c36500ad0b8d911598f1e4422b1a24b4a158498. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEBE72400168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec0266b8d32858aae0e0817bb34735935c85d0962fc30fa7fecdd795a207a27. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/DEBE72400459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9985121e9821656cd3700c0543f82edb412ced5ac89287c40f0fd2c1aa576c. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/DEBE72400460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8220e19a6684b56c4c858350e545593c98881554521aa38073f59317a6d5ed8d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NLCK42410985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c5c8042b5b2ad50283ead10324981fd2046e997573ebeac4de85fd69eda383. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/NLCK42415358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580c9d5a65539c2fa89a9c4daf3bb055ae285d96bec5d2ca85302191e8979697. 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/NLCK42417992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc54901af2fdc86cbe60880105502030934dee2eb199b923ad5927226dafb0c. 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/NLCK42417995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf471618a0a5cc330efe95b05959b3f07ffa7e3661bf89b23824d6862cadfd924. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QMSL32500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9691499b271b87a18f7a08062cfddfc7b6200496f7a3894c4434128aa6a9c2df. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QMSL32500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2548c2917d324051f4ad9cdc052363ce183cc053e13b89dfc66f21b48c739e1. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMSL32500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e835deee7c3cf9ed0fe1682feb3f3a85628dfc04b5d0f16433dcca43a66aba. 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/NLCK42510018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8ed4dc5efdbed7548545dcabc1823d9f28919f2cbe234a61964a410d2f55b3. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/NLCK42510019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71f1f50b0beb95a8301e9c0fc332f8c0f42098433bb66747446d0b33e0a033e. 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/NLCK42510020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a7b07e2c78b38a6047ccecbd1f009129753fc2f96aea9cc6a0cae5c7d84127. 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/NLCK42510021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd4507e4bf0fb96cd16a18ce206edb4007d13a8efcaabdb6f52181b1e092e68. 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/DEG932300343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13965dc42730f519ad0a2bdefaa5cb1fda49b42fb0760514e82694ca79b0055a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEPI82310514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881d9ad97c793020a39f94bfefce6f0da0938e88e11e442eaa7f4533e6223015. 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/NLCK42407714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57bfa86989e16b40af85e6f59faf3fc281cb1d2c16eaed91e82ad1ac6875e4b3. 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/GBEXH2401934.