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 0xcfda485ece62384a52259b4ac1a5bae40f2105d72597fa77fab10410b761266d. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df78e393-9ccc-48e2-8e3b-d4d6b04204a2.json and https://artists.proofprofile.net/proofs/artist/df78e393-9ccc-48e2-8e3b-d4d6b04204a2.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 0xfe02bc50856634a3da37a58c4e63482d82b537c75170925c6d0eff3d74e8efaa. 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/AR0982480006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead2dbf9147e706b07b143f1634cb29c70ff5509aa42f827443af0870af7851c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USCGH2378403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb5448f1ee3ee96c087518dceae22f3e0fdb149a84b1ac3d9d87119496a582c. 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/USCGH2378404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7d30d8f3bfecaa972a74e475a0445298dcab71117cf046a43cc8ed02c256c0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USL4Q2282483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f505317024c9d16b6ea1076aec9b67e69fac3aae2469934bf1b132297b37bc. 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/FRIDO2416108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e7afc87fdda53044692794f768badfd101546d59a771fed34ef31a503bf83c. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FRIDO2415328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34984e2a567a7268e30e7471c416b57aafc488b60951711ad72db3e11c9a55f. 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/FRIDO2415329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0482b352bc189350a7e5b6f73c4942752c8be1ead688623ecf63ded0fb53c93a. 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/FRIDO2416109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087e9e7324f0f164de7df130278516e7974838d8e61986682972bfced87c8e38. 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/FRIDO2416110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d6a67a6175fbf5648d457adbfdada223a1305a831e646a2af5ec4835150e1c. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FRIDO2416111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95eabe5a252cbe7dc25b0775c32e2edbf395c06b6a396ca65a2afec2353ac94. 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/FRIDO2416112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8485f5a3c790b096bd1636fb984e2552793963ea6f32b8d09f37be51bc4588c0. 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/FRIDO2416114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9279b8041358c8cd0757bc1bec398381cccb5261abc80ae945a75eb492bd66f3. 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/FRIDO2416115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb24ce3f92eb1429eb01adaa76793a99324a16e258ef5e67bd1fc8a6e52e8137. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/USL4R2375545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85bf726a216cff72e5fd5c192f0a9c83d7a33dce8dd5d4c86590e63adab19cb3. 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/FRIDO2416116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0677072d68e38072e90e61ee1bec8828bbf78199bcdf484f501c96505882698. 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/FRIDO2416117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6adf3d150d0a4a7777a7c205d367d82b5bbbed21fe4d0fc145c48a5aa53475d. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USHM92463728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e7afc87fdda53044692794f768badfd101546d59a771fed34ef31a503bf83c. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FRIDO2415328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6adf3d150d0a4a7777a7c205d367d82b5bbbed21fe4d0fc145c48a5aa53475d. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USHM92463728.