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 0xc0cc7fc59ec1438c169a4249b0186b3d15acb305f77908a0babdc58f62b0a842. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65ba3e20-ea55-45ae-85dc-0637652f1977.json and https://artists.proofprofile.net/proofs/artist/65ba3e20-ea55-45ae-85dc-0637652f1977.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 0x712c483dcb9f4964d1b31b2715ecda9ce91741fd3deb661ef2860a22eb8008f0. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FR6V82323536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa363846fe057c35d5fd801f44d0d12c4dae90bd0c1d0501e253c3533358993. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FR1051543968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce90c431c5117b03378e0684ec37aca002e07ea13d498777bb2625d48da8fa1. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/FR1051543969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb027e370e8af3418e26334864a620fb2ede7dcdac85ccd41505db67a24544699. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FR1051543998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd308a9ed59d89c63dea01e6978da5150612aab7efd417a5b5c861c5278094949. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/FR1051767205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e6e9796c53825ea2fa231f1955c1bfb398280f3d3bc001a69c72216c24855b. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QM2PV1767462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14967d480d7f558cd0640cc6cedea3f88ac12603a774ecf264106a04d9dcb232. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QMPKX1846481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06620a8fa02adaca5e0cb693c729893452036ef44e1bf4b5a41d8259f624dda6. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNJZ2440287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61378a0bbe70afcfd80bdf33bffeabb5b495409074618ff35882ba20ed6dcd22. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZNJV2593834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa35f8f6bcbd8d42076cd2a00bfe68fe24c8ed150b10c2383559e13cbda4622. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZNJX2517644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f7025d3df9a7ecf19b0a3fcbefaed2b63957c3356f454e36a9e99bfb9bf349. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QZNJX2517645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ac0f8369792821d3d703d812e12ce12f019d4f4d0c1b120a580480f152f358. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZNJX2517646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358b769570f01afd7f6e92fc15cf5b158ac1a6c7830987d269c99c304df3207e. 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/QZNJX2517647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7a6ccfd52ec16300e8a7ddaa9fd9cc1fdb3e0520d877ee87f7f1deb93876b6. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNJX2517648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b25757628320385d374c0c1f85b095f9a9bd0e9548965e93cf39c64c1262191. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNJX2517649.