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 0x9b776909ed34f1d22ef44fd80948188fd8a7f4c7a17eb36b2bf85aa10b9003b0. 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/abc3f198-c18e-49f2-a842-11a3c43c10bc.json and https://artists.proofprofile.net/proofs/artist/abc3f198-c18e-49f2-a842-11a3c43c10bc.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 0xcb88e84a8ea07e6af0a352d3e4bc196fc1d420e9829993e9362af78f288264be. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM7281961770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad2dd398086dd2c095982a02a091aecabe0e6532a625f4224fb7b1440c7dda0. 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/QM7281961771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83ac103d4d60730fc31b5320aa904bad59cf320597e697385b240890715be17. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QM7281961772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dfd28ad990d4eeea1dba3ab325813d36a6605a764c286043ca0b5f10ebce04c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM7281961773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fde3b39ff36cf367b1aae67feb0be44c52e5b52de2544ddc9a393878fd561e2. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM7281961774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5609afa4897c6fc7fdf78f637e62292797bc60f726c4b1ea4ae7d78635e06a. 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/QM7281961775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f122fa14924a288cee81d568ccdc9f74387d6e29475d7e5c1c2576270d208a. 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/QM7281961776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c96a1a28ec24763374d4e7d3daf72615ba7b403c9d5c7f8b2ae38f7c565612. 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/QM7281961777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a0ac598dbfc19888ee4415167ab5985ff599932de49f6934d8b4b63aa1e7e3. 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/QM7281961778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7311ab4b8a03be7f9dac952396db627b71d65b61ccf084a7aeaad04678f82629. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/QM7281961779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6594966636ffc16ff7f14435cd039a00ef396659f663cdfbe6502abe54c8511a. 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/QM7281961780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328a7f6c0b4ed52c48b963a016f091166ed13b9120c263601e3a097b3a82d361. 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/QM7281961781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98427712826aa29b76addfeb00967c348bc94dfbc6122cea3cee2c574f531ffd. 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/QM7281960759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa4f90343a2c38ba705775761e0bfbfc05def18dea4067466aec8b4fa564fe9. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QM7281960760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e30e60c7ac5a7da87202099359bcd1b00601a13e968ae8dfe5ec38d7047516a. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QM7281960761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6984d743c2e3272cdd0e0b74ff65948b6e795acca22321dd3ab990faa5befc40. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QM7281960762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352b1a0589e87320e0aeab422a751bdada987ca43061f7ff90f9423bcbbd42c7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QM7281960763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560a2d6c3467d51f38cbde7fcae5ccf0432121f1773d2e77925e7160ba6dbcfb. 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/QM7281960764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064cb01c62041fdc6e3b78b1a9dacdff2a4f011cf27de56f2057b7844673f6f1. 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/QM7281960765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f8db22a0eacf0b05e5e3425807d195728d2d91e89d74ae240c9a1b3e15952f. 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/QM7281960766.