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 0x7da4739c68fa8760fc2e742c644d7fc528d48f6f6ea50ba97ff814d63544318f. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84cee3e9-4a27-4371-97f0-25af59415fd1.json and https://artists.proofprofile.net/proofs/artist/84cee3e9-4a27-4371-97f0-25af59415fd1.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 0xe943e224590887e0c273f3e1ecebf0eaff0dc038eb7625a273c4d6b273e7692a. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/QZMHL2443810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae92b7abfcf4f7848495403e12d8d26001e48e17f129387bd0a65d066e5e3b3e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QM42K2431458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce940b48ddb5292183f20bfeff315e3395d620a6b9f1429ecf572db3dbcafa8. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QM42K2491778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8308f5cbf40a257eb86f1edb4e562fdb957de16e871bbaafdfc548c1dc95206b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZS652488898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1842613702fa86347cec24651215db020f639b267ec5ef28e5c1ff00c5c5e1. 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/QZS652423971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96527e34a0ff68d2ee2b8005960018093a3458e8b8753938105339d6508b82a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZS672465878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5672e8e5b9fff5a172f4a5ac7a27d4e62743c6ce94800caea6e4ba7915b02f56. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZMHN2488434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b2cccd10585b8bc5ea3b713b5474877ad7ba14d1a233b8fe352c236082e43e. 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/QZS652252214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8206251df840edf908df629c3ad0009a0e0bf29c168a1c731e8ba9dcf647d7f0. 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/QZMHN2063471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7b2ff16b009ef73290402672bb06dda31376639458dbd25493ca3ee155bf11. 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/QM42K2104824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87437e2c9f13d914a1c70c7aa0d904b5f08837fcd06a2ba99dbef6ee23473a8. 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/QM42K1951280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4bb8742ce3774992de26da784c81c5ac6608dbe09dac8e8e19e47e8e6089a5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZTBE2433695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257422f9e688cc832d622d11ac19f87dc3b49303c4351545f8ff27adc13285eb. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZK6F2448832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26746067e8434b86f87992a44250c9ec9d86ab159ac30c6ee9ba1cd0ab47ae0a. 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/QZHNB2502696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5512caf556662c3222b0e6180f3e7ad7507169f62873068ab040793395f45f. 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/QZHNB2502697.