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 0x9794b65a2891b19f2f71ed144b60b0304959658e628e957402c259c8e69b2311. 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/182908c6-c9b6-4ced-8a0f-35d26ec0097d.json and https://artists.proofprofile.net/proofs/artist/182908c6-c9b6-4ced-8a0f-35d26ec0097d.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 0x4d856f259c6610b0248c2895071cbb9f0509b74b5edbae24617da01416d3e5fb. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QM6N22040052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7268763cca7ddc00bcb7165c4cdc8e7f2052a8e44520b7cb424c7b983cf434b6. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QM6N22040053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93a3bf1e15122d8d37746ade4216df5aa5e0471c92b91b83be7527248c69c6f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM6N22040054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726b2df1e06693bf68075382459d68618d0c06b508ef4826f63fb1a2710cd989. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM7282056362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd1a5f6cb2a8adfe27a8311af0956ef941770472bf4efab15f0230d181f1965. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QMBZ92005071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905a86d759046f6361c53ce7c3e3079dd1d9a0b4d3e87e864888030127bb7732. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM6N22090180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4353007edd5b2febde2cdd934664b24ce12d6af3f9da91bbdddfbfc5fccb9c. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QMBZ92005077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184f25d1aac72da6aac22544fd0bde960e41c234e7a3781928e9724dbaa358cc. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/ES64E2487022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3db15c5e235834c9df88cb7de9f38f90f7467612a77cd28d18c0ba3ec24a9a3. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ES71G2428494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1804e77004f055a9fdb536b3df482cb6636fcf79e7cb10fb209f8f60a431463. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES71G2431792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48af759a196b292749f2b1b55cb14c09b4f60e2b7f743b5002f1ce84ae22ac05. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES71G2502502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e025aec0b377728ff23bfcee4971aa93e8295a343c4e64436a2fc3ec24d8e47. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ES71G2507783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3202b82bba4b760c681379e6537845a97685e637cb3903c8fcc34da95a073732. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ES71G2509059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48af759a196b292749f2b1b55cb14c09b4f60e2b7f743b5002f1ce84ae22ac05. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES71G2502502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184f25d1aac72da6aac22544fd0bde960e41c234e7a3781928e9724dbaa358cc. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ES64E2487022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805d44a3fcf127ecb9b734c33f41690dc0332edc5aec8404f4caa32568ca09be. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM6P42068795.