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 0x28bb3f9c84de949298c1cd1eb00e15198d8f86944e57db9a26886a0f8c8478b1. 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/ebb2d8ef-667e-417b-9333-17d4a0c659d6.json and https://artists.proofprofile.net/proofs/artist/ebb2d8ef-667e-417b-9333-17d4a0c659d6.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 0x2b8fcff5262befac378e1c8d1c02cdd0f8df24087f11ff14bd66ab96afafdac6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/UKZGC2407812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c436ac7722c8f8cd86ef109fd1c8fb046322deb82ed4f842ab68e6068761af. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:03:47Z), 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/DE1ET2399248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb468f54befe1ac3f5704604722e706830d9610aebbc83f65fcb3d24f3ad62c71. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/CA5KR2515517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bee4183946958b6b4790b6f3814f8b6a9b4e0f03354976f24e9fedb73210cad. 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/DE1ET2399338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8467ebc40c6a5e261ee07a84c54a160cb120a2b859ddd4dd1d911a9b218dee4. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DE1ET2399266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10510356ed3710265862d33f6840a02c89b04b08291f96054087e2bae3c3b190. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DE1ET2399427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30134b2559c452b133fd6bdd92dc6e65e60c0310cab4dcc2eba85752af5e189. 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/DE1ET2399428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af68228652e5a4fdcd7558ae2faf7dc39f417ed38d0ad4dd904d82bae8af921. 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/DE1ET2399429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e071bd3c9eb115b1cc728a0eabfce64cb030803b31b5b25f42dd0585970e5c. 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/DE1ET2399500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659bf2a9c8f403f38c9c2abafc7c7b9062b0a30434b74bf30a3ed89aa6556ceb. 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/DE1ET2399546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f36749db5a4776b448a239fa61b3d0c2fe1510ba4d3374c97373be2bd6e8cd5. 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/DE1ET2383256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55e0020bf0492c7dc79f44f77ff8a14c455930c860ab6040a1bd4c7f21bbb80. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DE1ET2383522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190c7d6c301cbcc1352b1382a822f0eb998c404f8382c98d2984a0042bbd0200. 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/DE1ET2383523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e16d28ba291c99d6c31bef9aa3aff877fd743d5959543bc281f2ea9673c289. 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/DE1ET2383524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef1d8d100638d229a9043af4f46b27203ffbd2ae352e614aa24f638a1f42764. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T08:20:09Z), 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/DE1ET2383326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8ab35910880c2f0d448c856881e7004c6d4c901b05819f277f60c6d925cf6d. 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/DE1ET2383562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c6632d5d5065a173880e6c1c925fa70427556ae272a46641cce0d830af849c. 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/QT5M22532699.