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 0x14109355cc36f81ce41b9bd771e4a5e8ecdda548b2940d546bb17f9455b77790. 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/07514a73-1065-4a3d-a4dc-bea0d0c16984.json and https://artists.proofprofile.net/proofs/artist/07514a73-1065-4a3d-a4dc-bea0d0c16984.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 0xd0e3037c68216f5aa912fc94a07176600727387c38fb327005236305d7df9c68. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:59:57Z), 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/QZN882119341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256d09fa73577cd3a768bb70722e8fa5041bfb9567595cbc3fae3cf8cacc5061. 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/SKG881400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff0c5beff821db698a600919308d29562b6118feaa0cb76593c7e684565c30f. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/SKG881500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b7993418b4e582d15c4b022cfb57ab28fee64fb370797a49c408421f807f48. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/SKG881500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3482f59d3def52feb3fc6b1ded4e6670533317e433a862c10a4f93799c1142. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/SKG881200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7194bcc8ee9e7ea096802a82a66366cb6224d2e9fa4f175429409d896de5a4e. 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/SKG881500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e249323c424c57b3561722b3148f2e00ff0daae7455128461341ba37a5e1224. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:09:12Z), 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/SKG881300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6475653de36ed21a03fd120ebdc119e233bb790ce49625ee1c98764459980d21. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/SKG881500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b015b82fb4732ac1682c88e38718cfa8f1d0093264d6ce7318af8c0176ffa2a. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/SKG881500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400786879b93e55f8e34d4d7455f66c66f1222084e2d43f14d7fa681e6b03229. 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/SKG881500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fd4d7d211c18a4d19513f2deece5b292c9e5adf51c8201caaf76ab293c83fe. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/SKK841700207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7919b9f1b7b88fd1d7e5b6f70ccaef123533bc60abc52dcac948bff6bc5ee5b. 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/SKK842100401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d78ac6c86727d5e4df0ce7dad1e409a46e9d9eaa97f9dd0db1867e78da261a. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCAGJ2216362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035408fd1413808beab3c0a1b06a2fcde69a6b1d77b02c5bb169a7b719c480e3. 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/QZYFZ2465642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4212ee578e21835ee6e21023bdd6aa58ed06a2350165157ffffe93f18d3d49. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:20:02Z), 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/QZWDW2404527.