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 0x79e397c835adf66811d015cf0d93e6422dc11d70a1b6318cca412b7e54d789cb. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f39a2959-df80-493d-b7a6-d26395ad0c3b.json and https://artists.proofprofile.net/proofs/artist/f39a2959-df80-493d-b7a6-d26395ad0c3b.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 0x0037fdef0d1724e238f0d5388cdafc1b21ba8fe82019a7f4a8b6acaf16a5822d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6F2536451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a0759510f90f90edde74eae9da36cb28ddf5580bae280374d0d0e4a2460596. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZMEM2512781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76621c25520a44838008982414c1115e8caedb67250967ad112792d2849c1767. 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/QZMEM2512718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a688452f75aa7169e2eb099fd52ac013e47c4aca058ac5a33c245cd16b8a74e. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZMEM2512786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80b8ce1b7f225fa3d52f356be6a38413ae01cddd81b4ec558a208ed6db16126. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZMEM2512846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd35f3431264576ec12b9f89a6f743465ab414f09d8c137cb80e87f5749bdcc4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZMEM2512856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efc07736e195a324ba835c0a3296bc5172c9ef5f7e0e15418b8417205e9b8cb. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZMEM2512783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a871ec818db4b0592e93252cfd01fa6c502c544a6b7da3b208c2fa461e1e683. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZMEM2512738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0863c1f7a71bdac04dc35955bd15100bed6e5b8ff8a332c4cfe0f9f8ff7550. 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/QZMEM2512848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1d3d2b0870d158f2b69c10d9a6354fa17c1afccf8bd927f00adb1a5e68e95a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZMEM2512770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e78a080bfc59d1e463d1f2f67c1b6d5d7ead79413b9a23a2bc6415378fb2292. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZMEM2512746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8342e7ab1168763a7d0b7f5c4441ac51ecd6ec5d9db8b4b40c868ab07f9dc830. 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/QZMEM2512744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fb0ebc251f301b7e04c91363d2ebc5f64c8fce17604aa1d6b3fb39a26fd80e. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZMEM2512859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc774b10b8377a2d72ebcca1a7a6d118480943e1ea42730607078d7edf6be6e98. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZMEM2510802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267c3c03245322aef2753d2b59cd2ef7721c87685fba2e0d2f4100f227c6bf3d. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZMEM2512880.