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 0xea1e0d95e585289fd49e1ac23836cecf7bfc7f2c405663247bb9c676a86935e3. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3daf4007-ac11-4f44-9822-cc67804bfbde.json and https://artists.proofprofile.net/proofs/artist/3daf4007-ac11-4f44-9822-cc67804bfbde.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 0x635e8b1ff8e031dfe825ca610ab9ec143df0e3e8f4b5ce7b4afb12583faf159f. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/PLI365771020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167c945af4c7f3977c513c171c667a562cb9df2ecee6a077c9429604cdadf3d7. 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/PL31T2300678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a7cbed989038a7ea54546bbc16161cba1f50e30d10b0376e22df4e7d78f987. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/PL31T2300680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52edb400003baf90bf01d5cf0107667cb670be41331f4e2506d7a9ca539a40af. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/PL31T2300681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d2fa88cc109639ecbbb51aa9caadcace775fd555d09e4fa5352a75129ebfc6. 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/PL31T2300683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f163c0f7704794ad42c8c535136644a30115c23b5449fdf79d2582f250261aa. 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/PL31T2300685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48aa5d64c4070b7aefbe36f7d16c580e580b44f82d121faf92f2e479aa988000. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PL31T2300692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde53610bfb1eb85384d462abc6eb2a1125ad72c277ab1e19415a8528fec37bcb. 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/PL31T2301048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e78952cbe50463c0e90c6920385f293e6de33c70e84a3c6cafa593ba755a592. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/PL31T2301049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd1a162a4fc0dd1ad38dbf59f5e65c1cfa2bf1f1754f885441554c496e6bf52. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/PL31T2301051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f79c2df5fff2fa5130108beed6ef88849d533f6e1d971a4afe6491e1cd25e40. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/PL31T2301055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cea75eb35ddec0b5e3dd27cd785af7de0741ca4722a26291d4effe830e8176. 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/PL31T2301408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a6fb8786bd4a1d03691cdd81b9ee80848e0114218c4842ac68ef7e0b4c060a. 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/PL31T2302758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17fb75cf67cd53ff4607a09d65acf483ffa4c13104d43e3fdbb2a6b4862adf3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PL31T2302760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5167dbeb405ca1f8f17196480ab647b8ffd865a7fc1acc359926694c248176a4. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/PL31T2302763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74a986216b4b7f6dcebd5b650581d82aff0a5caa573fc946f4e7b98ff537c63. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/PL31T2302765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c40e3cac14a913ad5d23cccbb9f9091195873677333028e41726444abb33a84. 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/PL31T2302767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643e6a1d84b2cadb4d2fa7a04aac416d543e0e9bd020399be6c21e658ba6b9b4. 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/PL31T2302768.