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 0x70141e1b47cc4de1581acbb520135898f47fc639a4e2ee4ac929464bb098daae. 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/e2e53e16-ffb5-4dc1-b480-77185d0efe26.json and https://artists.proofprofile.net/proofs/artist/e2e53e16-ffb5-4dc1-b480-77185d0efe26.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 0xc3325ac1612357b0f4ea57cf3a37782d83b900db573462eb7a107aab04f09a71. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ZALRC2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3942890ccc5c0686d830c51f9d2e6c0fa7ab9b76720788499131c2789c14ec25. 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/ZALRC2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f69bf5ea5d109deeb43f7f4d070bf466716c30b1a0ec3aa5137c1fd66537c0. 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/ZALRC2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e99dd26917756aa88aa457230c2827e547a8f5809bef98b47a50db3864f635. 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/ZALRC2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1c8533695e2294942e35d65fe59b9e203cf16e8e4ab7219349c9f03f3a7eea. 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/ZALRC2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c33aec21c5169bc6c1cae32a9810fa80acaf3497b75c34d54cc85d09367ef6c. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/ZALRC2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1940111bc873d7c26b9817496873877ba5cd634213c888ab19ed8f4fb031dc. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ZALRC2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e3b3dc5855601ae6231c233d3c0aef840ebccff5b39f793c519e4784756a3f. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ZALRC2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75c661f58ec82b5a744e5588236956df4319ad3a44a10a3293f003965d16cee. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ZALRC2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d811066ec4cb74efe77be45cc6b398162b9209755539b67df7d39023a4be96f. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ZALRC2100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722fd18632cbd13637014efaf2764a7038cf425a431f604b9715365ca4ff3285. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ZALRC2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee126357c87f675c649d38e6f47ffd6ad5bf546c8607cb487919ca847172fe5. 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/ZAEI72300186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed429b78b68807f4b001644554a4585ae5be7729397c85a19a72c312674f0af6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ZALRC2100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99639ff54b3779c819b472a20e847c36c568919219cf8f52a284fe519b30782c. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/ZALRC2100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf9ab9c5eba0af988b80bdb676ef0f265b7234bb188df23bd5dc72797b1a2b0. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ZAQ652300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbe28aec38e890fc9024620723f454a51b25b022451770a48c75c474e8e705d. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ZAQ652300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c8b56ec3a6543c180e72e6945d5a0aab170f7a6a1bc216698ad6ac45e561f0. 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/ZAEI72300107.