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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02b21b7c964bd12be82d4b90df93b6948d2f1402db395de4f3df139fbdaa9e2. 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/aa9f29a2-b0ad-42f7-9507-1bc3a3ca43fa.json and https://artists.proofprofile.net/proofs/artist/aa9f29a2-b0ad-42f7-9507-1bc3a3ca43fa.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f99b23823ed896c2810e2bb0b75a5b515ab799be5e37b2d2e23fa3fedea37a6. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:03:55Z), 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/US3DF2174211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9524a6dd11d91b067e46941bc7cd0beac2f5b82c88d21755076b795092944d7. 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/NL4WT2200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a39f177d06c168afc3c81df35fd2a89d5435ca2e42933fddf0651df4acbca3d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NL4WT2200147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8075ac062f82b44e5f5fa0c5f1e3b1a5be3e4850be1c6ec92050c63c211b0fc. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/USANG2239249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8948144d3f94937c10613f8444dd627bc372a4611449accb994d72024a1400. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/USANG2253610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15de43e565a5ed5510875071d8587f701d022080868a2892379674f5094a7dd. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/NL4WT2300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871f99a76171857347bb39bf464be46a22ebaced58e769e28432062c111c613d. 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/USANG2283727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18075be6bacda4b377c27cc2d3781743bf35b1864f3eff63bd646e3f0034bda3. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T05:49:27Z), 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/USANG2294845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc42207584b47e2373e17f37e80d2e9faef8aeed548e81e60df5ba3fe752823b. 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/BCD4N2100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8041a1202ff0137af41277b55ac51185558e8e9846b4d7f5925eeae8c6130b. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QM3DF2168617.
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