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 0xf3ff9499d9d1699719c72e4353713de479e32dca665d6c8ed99f6b94241bcc90. 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/95048157-8e27-4efd-b446-b2d9b8ded0aa.json and https://artists.proofprofile.net/proofs/artist/95048157-8e27-4efd-b446-b2d9b8ded0aa.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 0x09f3c50f05422062a6bcdb5d99d0284c42fe7fc15357589973d2e9ea92f8a24b. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US3Z40407257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e44be3f4f3d9767e30e6b02910bd2502a9c7159999d386e449e8d8e2aff517f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US3Z40407258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2606e1a27ecf8c848645c79aba03af9f0954bea9cefa2129bd485e2e35856b9. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/US3Z40411093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160198eef4cade983fb3902bf12145ebc5eba097709b5fab7f99089c0ac0c6e4. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/US3Z40411095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a6829084f1aed4f74ea44398b068cb904b9131c606d2a78bff932f23113592. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US3Z40411098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d721cea997a727acb80a1415cd2dbd48b2ce7526b211f4bf97f135f952814c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US3Z40411103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24aa7b0511104c161b3b4b1908d5aaf673b95155e1b9fb4ade60ac141a33364. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/US3Z40411104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9524aaa4c4499f6c1eafbba0d0b3f2c8399e63fea0e98ddf9db6ff383a9cac7. 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/US3Z40407256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb5c43069856aa402b105b4a15e4ee62a1a8f94f497900ef19e0440e7d0d998. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/US3Z40411099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a766ba54e55feb439060bd60ca300de21a88a5f01240f190e6be08f4a821a9. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/US3Z40411097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29b74c4184e18e213f5ccdc7e8e85d7a9e1c26cbc5b6704e613515e03ca5ded. 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/US3Z41700330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004da613dabd4dd8b0cc24cdea55e1df7c479010f891494af1f54b41c087922d. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/US3Z41700333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a9e8c218f787f2b11388e279209ceceac906245bcbc89ddc90bfc03cd95767. 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/US3Z40411094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9caee92f8063edebb4e7676c39f137e7348668c34ab755e5938749ba7fbf8b. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/US3Z40800123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a38f48763784d572133697addbb8cecddd6706f00b4dba73dd13cd6bffc30ec. 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/US3Z40800261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a6829084f1aed4f74ea44398b068cb904b9131c606d2a78bff932f23113592. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US3Z40411098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d721cea997a727acb80a1415cd2dbd48b2ce7526b211f4bf97f135f952814c. 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/US3Z40411103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8fe43a73b3f9b8c9003bfc243e9e50097a6f9c908fd73fc1858f6e41d8e123e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US3Z41100078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e94d5398610ad105828f7d027307cdc5fb3b1d0267143e319f2c71375e26e3f. 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/US3Z41800015.