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 0x4e0af796295dfa10b539b5f7264d614b83068dac96a41eda783820454a07ef14. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1345c546-294f-4b1a-9e3b-2dfeebb3341e.json and https://artists.proofprofile.net/proofs/artist/1345c546-294f-4b1a-9e3b-2dfeebb3341e.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 0x40b4b6926392c8944090d3938c63b9c2b4c1bed4b226fa24f1609166fa30ee9b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INS671500633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5edc5257a2e5cd9aa1fc9d37889c922e49248235e0543a8929aaccf617923c. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/INS671500634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb10efc279eb124d83c57a424e9a33f0bc9cf0bf10582968d98a4d46ae15401. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INS671500635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2528ec5698ecdb4a5c0123e4c11e7b7100850f0361a10b32e86de9ead98bdcb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INS671500636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823f0bcbee813ff228b81854fe9bcf9982c805d8aa40e859063000bef070a0d4. 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/INS671500637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfa040489d97ab8fa3babbb9fed9d3a93045dc3a5b790df95994f62eee5dc90. 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/INS671500638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34baf1e58d658163ca8a879fb5e368fbba164dca6dd7ab11d4032e61b4bd5f82. 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/INS671500639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3860ee02d0c77d50cf507eafee32586f03d9ccb6f395e1d895f0ea9a6e153804. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/INS671500640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e02acee995571923fd434f4c8e615ae1036e0d8acce71426abbe91e02815b1f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/INS671500641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e592d5430abda33a298596cd02d570eeb4cb53b26c84e1f3baaea9dba06118. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/INS671500642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5547b40b5c34aec88020b6fc4aa9336bac590c513473598903bfc24f8eab6a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/INS671500643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084b1ccd02fe0a9104a175f73ffbcbda804b30bf91d87f627e49b6a34c959a11. 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/INS671500644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e7e3a90acc474a3f2c7b7c2fb4073826f96f0e615837605aab510a98974e91. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/INS671500536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a5d00f3d1a97a1451f8d62c2777f4e8d084f4288ce4cce03dcf985b5f1b58d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INS671500533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28dc46c436a9d1f8468fb3f7ba7d15491752569f712855c013ea2ffae9d3ca5e. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/INS671500659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6465a2c7e976e53d07235e59f348c203c68fbc13bd0260219bbf4d03779b6b46. 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/INS671500660.