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 0x5650910df186229bcdbf6565a88906fcd9bbd0dc88ad1020728a66e28a126433. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d674fd7c-9051-4f84-876c-dc07192b1af8.json and https://artists.proofprofile.net/proofs/artist/d674fd7c-9051-4f84-876c-dc07192b1af8.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 0xfb4b111970c1a499553d87d2aba23a7a1c25000977ecbc935411a28c64c01bb5. 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/QZNJV2320405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8db0a01886128a114bbf853c4396c00da25c7cb60d0fa3d1a093ad6d949836d. 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/QZNJV2320403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x913ca9d9cc2246ff5522bda44429d21b51acb42bd4c70841deb49da7cdc98f4f. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZNJV2320402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1dd791f5134cae641dd9fe3b134795684fdaccf10d6521fbb3aa8c99ce19f4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNJV2320404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfe3029e81a6483e5dec3936978897333acac075f43c7ebed5a52a5c5e4df21. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/QZES71880493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cab8e41865d979b719e51be1064fff2e73c47d51034764bf396f820e48f0623. 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/QZES71880495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb8b4e451fa62043b6a52b227f9b14c0d7f92bdecdca144b84ba366ec26b3f3. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZES71880497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd24e9955607a59eed97709949ebc90ac08508720addb3cd3f4958e96f02efcc. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZES71880500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e533d1a05d4672d22c6e6f095bb0630fd27ab80e97a4eac79d1f20ec0a359f0. 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/QZNJY2374933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42b662d385942b9fd2e8f344045c475e17cd4234315b18a0f4f456f2e3ea1b2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNJY2374039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a26f84f29bf5bc3d3f278f449ffd09fbfd0b19cb65288954d61efbe482705c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZNJY2374040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c5dadb3633e1ffbb1bfe9d303cca5fe3c0649701a408bcbf60ccf153f21a5f. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GXBDS2333973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ef66595a5bf3270f398d172bd6dff58cb6011ccdc55d215b8236cd0d24447d. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/GXBDS2364643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810ea8ca111d56fd92f60f3ae4ac0672429d07ce3fc27f9271253b98f128021e. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GXBDS2302604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3c627901cc95af6ff25561fe618c1c292f8a7ff95e0086916068330a58781b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GXBDS2357634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e496283a4a43f1c7c8b02cec81b53786fa5dc6b5447ff50376cbc7ca5f0c09a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GXBDS2376821.