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 0x367d7fc601c162a7ad4d78ff6ce013e20121ab6b347b1cf20346c4b38ed0f2db. 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/268b4f8b-ba16-4a05-b738-577f2497b46f.json and https://artists.proofprofile.net/proofs/artist/268b4f8b-ba16-4a05-b738-577f2497b46f.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 0xc2a78f2eb46a3abe18a1670dfaca5dba329d665d19881bb585971bf2aa7d8d99. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/TCADB1762318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3059dd8d9a81cede3a40eee2282d51b0f3d2fd955c13d51bd75e2a4ac19f199. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAEE1920376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dac305682cffb1436c330e45bb4d623ee73fa30e11b099fcb6d66c90448d17b. 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/TCAEE1920397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43a71e47cbb3f51d0e5ed64fef74e2dc99c7c12238c4119ca260a92731b617c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAEE1920420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae418ed6233acaf113d763903d02560fbd3748e429ef8cec0dbef14e78aa9b32. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZ2GW2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1efa2800931c3e4da28be1471deee1b90b5b82df356a4b3b4f9453465f74d7. 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/QZ2GW2000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a4ed688761b608408f74855fac2a910dea0a20058d7bc9617337134b53e7a5. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZ2GW2000063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478091cc3cbde0bfe91e72bb6319c2f4006fba0363c3a33c940e99166516d4d2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWV2066166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162bd2e606eef29d2161c8448c7299f5bbce3b6eb84f2c6139944a441c5f4163. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWV2066169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ffa8dcf5a6874bc7edd90d8cb6e64bd5888fb9185b180030c1b10e65361c5e. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:57:02Z), 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/QZK6M2317009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6823e8bdf632e8fc37e929b73139766437979d92784218ff55e4c6a861cef2d1. 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/QZK6Q2478260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188d63094fae0a8531ac54ab2b43a32243627284c490f6dc3ffd2acc4bfe3819. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZRP42477439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1eaf07e2942693d8df5e4b88241b92701bfd603170183a3bb67513904156acb. 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/QZHZ32193298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efe22749bc0da76129dc625c0458e48a2e0a0b64f1af05ca71e121215125ace. 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/QZHNA1968807.