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 0xe1cb0d571f74b756c9120633539688b50a82964a0e0c84714c81d625e0c5aa6a. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2bb0ee3-45f1-4736-9753-775569ecda12.json and https://artists.proofprofile.net/proofs/artist/f2bb0ee3-45f1-4736-9753-775569ecda12.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 0xf699a1f54cb511e3c3517e274e27d67769265a222748d9dee036ac2930fb970f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6H2486597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4bdc6003266c5a0b30d34ed38adcecdc51374aa061eae96812e2d7c56ed338. 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/QZNWW2461674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd04c79ad1a842f4c3ab539ed9a54fefbd0dfe3a03447ee1a2e1cdc9e832640. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZTB52476998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde753eb18e236c245a575db61a51caf49810a5a45212527770c0fb7352fac5ec. 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/QZWFG2464141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd04c79ad1a842f4c3ab539ed9a54fefbd0dfe3a03447ee1a2e1cdc9e832640. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZTB52476998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a5a48026795ad7eade0cde509ac0dbf4ee5fd7ed2a48d9a9bd78666a8db3e3. 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/QZNJX2411654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf699a1f54cb511e3c3517e274e27d67769265a222748d9dee036ac2930fb970f. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/QZK6H2486597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0735641f610324098d0d805330c2fdebd87519e73eb85ea99eed6a1569e0118b. 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/QZWFQ2310169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc245eab723af90459eff0eddb4af267dad372420690175be8640621cb403c7f9. 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/QZWFK2302844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bad540733fcb5357aea84bcebdfa56760f74be1f4621cecd63f6cf6ed90cf89. 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/SE6XW2180167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21c4a34b596e1aa9e83ae2283b8c24455891e96abc9fe3af2932ffa132019f3. 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/SE6XW2180169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959ef484917a434a9e8795e0d92689baf165c1ddefa7f60d2762def239d7817a. 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/SE6XW2180170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe416e230dd2dd9b69641d91212900ec5b074d7983e20179cd484a8c18dcfe6ad. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/SE6XW2191087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40758c9ec5eeea1212d0313644c58a3e8bd370acaab656bf2d302775a8831eb. 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/QZTPX2392698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7311e95e2ca766f352cb337f4a98363ccfdd7871aea20b7a12d89a6918b4f372. 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/QZGLM2397989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463b3164d6b767b5a8b2178b155c0c8c44e8592f60d9b4202d002f8aa2a6aed0. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZFZ32488256.