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 0x63bdb92fe87381f2d8955bb935e76ccb3e486be2a3612438bc51f9c5eee7a36e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb51bff9-d291-43db-8f07-390401cb0ecc.json and https://artists.proofprofile.net/proofs/artist/eb51bff9-d291-43db-8f07-390401cb0ecc.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 0xc06b524b5404b04edb281930de9368d7997b3be7d83d6596eb971d2872392137. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QMFME1549058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa75daeac2fbf98f0f85d62cdb28ca3f0ddfa62f8f8d0bc31c937103415fefa. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QMFME1549062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20e1b45dbc284bea861c8fd567e2c8b2c288f7d7a4a545dadc1b07e16f6167f. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QMFME1549069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb732af70746b0b49fd4d894de69f0f87bb28150266cb58101ce18e52bff6384. 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/QM7281544303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659768a897fe3e50ab6f663753cdbc0af50443aa1bc0a3b6c44b07028ff176a5. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QM7281524683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c74d285828e2ef756d02dec432e4a27ef75fe4babbf94276bcc3f38bc53e72d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM7281524684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55eab8032fde8fa746770ab425645e5f58175ab6ffc6a4a02c57ee0a1586091d. 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/QM7281524686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425f151ab611d1f460d01400fdbf077312bf9f01eaf5b506a89df99081d0e5f0. 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/QM7281524690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859f163dbf54e5ba1358ea61f1d250ea744b524080bb3ab2d57005269243343c. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QM7281524693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651c6509327defca58e8978d8fd9715c135750b476c82d41a88f22d606bd8eff. 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/QM7281518454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b315c69969eee396036a23b8197c40eeee77e6a88b9167c77275966b45057a0. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QM7281518458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b800749db35955a773914544554840faeda87e34229b91a086d73e15624a4c. 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/QM7281577897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5e6d5a0bc49a9cdc0656bb5ddf52d1626bfe9f678a9c3814ebf2888900e5a4. 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/QM7281577899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b2bf3302bff14b2ceab96c077a84f4e619805b50ec92bf765ef162af38c1cf. Chain 2 (Bitcoin): anchored in block 957895 (2026-07-13T18:41:29Z), 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/QM7281577902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e51cdeef3643efce881152eff7d4bddc535ece12ee6e0f0339d33c3469ca41c. 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/QM7281577909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421d1c4db0df7bbf119a93f059dd4a4d80c1af33bcf2cd2131d929c137f57a70. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QM7281577919.