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 0x73ed0e0ac8c9f5b07ef47349972ac45bbd495368ec9998afd48f9e3ee18331d2. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/427198d3-afc2-4fd0-9cea-04cb0ed65316.json and https://artists.proofprofile.net/proofs/artist/427198d3-afc2-4fd0-9cea-04cb0ed65316.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 0xf0a0e9d88473bedd103bf43adfe5307a87a9b8ffaf4ab783cded353e46b980ac. 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/TCAHU2441141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d322433bc1ca406beae36430db3449b78a4a040381cebcbc15b53c3cb0b3f9. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZDQH2439493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca79ccdd04fc2ffc3094a6f8312d600bf98d9041f99eff7866895721f6b804cf. 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/UKXN22321094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03dd31ffa9ead64b74b36441ff26b2a32dcc03be2f79bb616aac19587a09c0e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/UKXN22321096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387a32d847aab950ab4884772410d2022ed9b706e639bddfc685d47c1b2c1d0a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/UKXN22321098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb785d2bf5a8c7b2fa94c61f2075d1dbf60ba32b632226bc0ebacb2d8367c788c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZDQH2500680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468d26be872ce8010b3b25dbf71615052190b1226831a59162016a9b46437b5f. 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/QZDQH2444840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520a64797aeb742b2eebb3a3747b6698a2a76f9d994e9bf599dca3e47f0f31dc. 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/QZDQH2429387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4e6e872b23b5c910c38d028964ae5d332db3e7cf62a41c7b158fa9286ad4f1. 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/QZDQH2427280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a0e9d88473bedd103bf43adfe5307a87a9b8ffaf4ab783cded353e46b980ac. 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/TCAHU2441141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd447dbae90845649573331de6f820a9f1cd78aeee1d053cefec53089c231f803. 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/QZDQH2420424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a841a563a7b03ff58bd19df5419698019d15ba3fef2943954ca2c12cbfee8b6. 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/TCAHX2456743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6ac694365c72f3e773eadd621215d4235a2b4a9158201a9d113f170b2fa683. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCAIF2485712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d49a08011aab89908242642468d0c3f7fee7fe39401cf7f01a9a3176803230. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBMA22336339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ce5777048956ef93880848cb7c5f24a1b980b79e6d93a91c4f421b284e06bc. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USANG2118768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd8d577e1e568d6c3da95d6bef3ebca06e48aa396a9af8e5cdc06bcbd8bed6a. 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/TCAHP2321170.