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 0x568a839d9b0b114933a9dd8b3928424b79faf51491fbbe0606530bb78397aa36. 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/f67690b6-87e5-4b29-ab51-c20db11f02ae.json and https://artists.proofprofile.net/proofs/artist/f67690b6-87e5-4b29-ab51-c20db11f02ae.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 0x50f65826abd03238c711cea64921a8ead848c02e8e4871407825d95b9d340176. 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/BEZ561283052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71eeb8dc8925d9927478860a25938b265f1d92e1b65d48e2986a80603bc94cdc. 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/BEZ561283055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabcde8e1f07eccac19442d69ec46bce34a537130bbd01c7459621cc8dbd488f. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/BEZ560683001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0821fdc04563259f0d169f0e6f100468ff4178331e09ca9e3d59b21ec3551b. 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/BEZ560783018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafb86ca1f4f68cf94b95fd7a23c1fb08ed6dde1dd8a0322ee1afd92c6166959. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/BEZ560783019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabcde8e1f07eccac19442d69ec46bce34a537130bbd01c7459621cc8dbd488f. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/BEZ560683001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec339736bd6fff2a16bf60df9a87a6b9854c1f82be05524aca2b449278af87c. 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/BEZ560783026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0821fdc04563259f0d169f0e6f100468ff4178331e09ca9e3d59b21ec3551b. 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/BEZ560783018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f65826abd03238c711cea64921a8ead848c02e8e4871407825d95b9d340176. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/BEZ561283052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b1a82118e230f62d519bf300f6bd5e6060592c5c8f5a6ec5734479fd1a96e6. 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/BEZ560683002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafb86ca1f4f68cf94b95fd7a23c1fb08ed6dde1dd8a0322ee1afd92c6166959. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/BEZ560783019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d91acde00c98bfcbcdd4b705aa610fcae72aabd361e4f54d684dd9bbf44736. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/BEZ561283053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b475e46891244b496266290756563ae2ad514ae44deeadfb5ef4e9fcaac6d58. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/BEZ561383070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc529b367871f0cf38537e8d30d46241ff7d962e09581bab131bc858c04eac17. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/BEZ560683003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdf1e88f37b63ec120f623fa358a3af5fcc1e4f91019b8944c9b651cb3dd0c3. Chain 2 (Bitcoin): anchored in block 958117 (2026-07-15T07:36:28Z), 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/BEZ560683010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679b9b3205eaab5aa9c9a9b309786d892b414c9cf71553cb9bc1faa6ae5c128e. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/BEZ560783020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004a279942b2b068a435bafd44afaab5df3496a6146c9137e42e8fc8366f7212. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/BEZ560783028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5b2678d07d52e19fdabfacbc4d4e66d57c2636016a3f85ff7443444acf630c. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/BEZ560683004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ead773f7cf9c5364c0114ba907941fa4c91342c569170f74bdcab226f605b3. 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/BEZ560783021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fe8ed69c7e05d61a57ae15757f9f6a3694dfc921aac1d22e25eae29079a98b. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/BEZ561383081.
The Marriage Of Figaro - Ouverture & Aria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d7be2d4b4a19b41179032b64722514839eca9daf3ed0e9badd2048d582b64a. 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/BEZ560683013.