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 0x00ab82f5326d5f1125b06184d357936891f832db305e1bbed45ab3f7dd7808b7. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a7b3a85-f5fd-45f3-b6d2-247d5fadff6b.json and https://artists.proofprofile.net/proofs/artist/6a7b3a85-f5fd-45f3-b6d2-247d5fadff6b.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 0xa0dbbcc388f6ecb683136d1823e9495e5792403ee096733d6b5b22d93e414210. 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/IL1042001181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e7045c3f497ecdc5248f1683d92e18f50bb35908e57f15da2b5ef99ee1f92a. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/IL6191900045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53736c8d4079e7152ba91b5037a0958cc49093b8c71f6e037a58297a9c52dc0. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/IL1042003687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc4f6b0504c5f43c3cf8ab0d80edcd0fb51444372a5659fe20e99e62ee876bd. 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/IL1042003688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f373a57a7a888ebe531469fcbecce4b818f6cfb1b3f699f2883337f314cc7a. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZK6L2052545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4417df209ca2ab83e008478b416f72b21405ea09d2cac51053b94331b6e989. 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/IL1042407402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173cf555666a55439a962893347a5633e1dbe35c7c62d44062dbf4223bf1b85a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/IL1042407401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4417df209ca2ab83e008478b416f72b21405ea09d2cac51053b94331b6e989. 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/IL1042407402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54ce4243b3280cb980d3da6dcf0a8583c67594426161a329c1d661169712ea6. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/IL1042407403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1df21fb8ee46ca420b4a814f91caddb5aa834d93e6fc32a28fcae06dce5892. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/IL1042304131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04a493b72ae2793c87a2e87d02af92ffceb35fe6f8fa9d51f01f1c15066514db. 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/IL1042407406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe948320cd3f60c90b993f15a808e3fa3c72c58bdac86162e73cd263fc06bb46. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/IL1042302061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f01f8b48b5f4b941358c01dd8e1898b306dc0d491dff58befc69de5a2f4e1f. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/IL1042407408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7959ce337b7b2c7b1edade0b8f35c89162831e93b8ce064fff4ecc4a14eccc. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/IL1042407409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90864e43e91dd7e2ae898d7666467a05b9acbf5727eb9615164bc2c3ff4cf6cb. 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/IL1042006214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993f77fcb318054350920247dd59238c11a98374b417b37ca368e3fdb623f987. 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/IL2DY2400108.