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 0x72196d7a664a07d1cca7031f0a92f2ea71ec6f657e8bab7393c80b9edab49bc1. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a6766f38-2e13-4377-a504-a54d431b4fac.json and https://artists.proofprofile.net/proofs/artist/a6766f38-2e13-4377-a504-a54d431b4fac.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 0x278b455ce9d612192087720fdf4feee83d2dc87729e518385538c3f8660b4017. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZ5AB2398682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2540256aa20e0db116f2213733283508c4c18334d44aa5f0a01f9ee2139e68. 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/QZGLM2509806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbe147fba894e3448ae48a6a32421f1821ca4c095aaa5aa728837d9994620e3. 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/QZTPX2487498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5355b493a7159da0e9c76387542bdf6ce13ebc4c85e257c76a755ef454a3341. 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/QZGLM2509807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8570464d3da2d0222787fd4ef40d3a0be90bc7c9d1bd37a0dd091cdb1be04d7a. 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/QZMZ92461373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80649ce59858e2ca2d3c8417b05d199596d3c46908bacd3d1f97b843f6a56035. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZGLM2509808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a26dbfa585a41fbc054e5af1b1bb973462a96bfd7e2386c01b0527ef832cbba. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZGLM2509809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3362801278d82f3a9377e81a6ba07c9f434385b52dded1ba2640e4d8560ef3. 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/QZGLM2509810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e8542531a06e40eac72fca77d0949d74bfe876da75f7e8b949bbcc350ab8d6. 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/QZGLM2509811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e258345bce2d34a1769e7f3a0b8aa129d5686309bffd6f0b62a9c573e0fe948. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZGLM2509812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaac09ce650b5c5b01f36372cb02a1660b4cf0b93fa14de23ac7aa6d1e9764bc. 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/QZGLM2509813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928755313bc3ce69c5fa00c9c10df91c5c2e2591d6610fd0bd6893cd438364ec. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/QZGLM2509814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58832dc6004fcd4f0036b5ef3f7948514405cb0e601ac0282f20d1ffbbd8c177. 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/QZGLM2509815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c6309b12642a4a30a32ab8d8a177a2998c1436ee60afb66698e8c79d2c71f6. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZGLM2509816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4f3c6d4a52aa3a9342846e066a14de140041d14bab42010b9c50d7b8a964f1. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZGLM2509817.