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 0x3ad0fda1fa94882defea0d2afcc66b0bb4e943f3c2cf33f1a4f3536d382448bb. 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/aa0cdb2a-4e67-4806-8f7c-900a66803a1c.json and https://artists.proofprofile.net/proofs/artist/aa0cdb2a-4e67-4806-8f7c-900a66803a1c.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 0xabdb9e5cdcf3d5ff28fd203a68ce1f76124d4b649047b58c25c4e14781ec10bb. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZTAT2395492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d15be8689940526dbaf17c6db7c66a540c5e0bfc40ae89b2bf878056e8921db. 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/QZFYY2456782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902bb83f5eb6f670a944ea0c696eea7c5b1cff8c3a16604088feb922fdf0a15a. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/QZFZ72497914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb99395aeb2a8817d85a1e175ffa2f2190c1efe6b655ad8119b945144359fe2. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/QZFZ72497915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908d6d320a76c918493d8680c14f76977ee6e477428eee4d10e6ef221003102a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN82416982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86b1bd6494e4ec99bc21022d24dc55951851fec85479ab395aa2ad788b61374. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/QZHN82416984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1003e12ad4c81da0c994f78dd308c179e96b3c7cde8c1334e8231b911d0d42bc. Chain 2 (Bitcoin): anchored in block 958117 (2026-07-15T07:36:28Z), 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/QZHN82416986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde4440bb00c53acadc6ecb26fb027be91dea27525154a3532c184f7a7856eae. 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/QZNWX2499589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc179be300a093c9695ccca377ed39fa2949cfa9a9e959fd390c92fc22da5e26b. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZFYY2506352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfd2fba4c6a407bf6f3df986afb25bf402739e09a0407db12bd5b422fc44ed1. 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/QZFYY2506353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ecd346d9362bce011a191740ae5a40cae7b84eddb912cb5a6d0fb3879581e5. 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/QZFYY2506356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbde250e775fd6296c8de7b8119457776217ab7324ed7f3b59f49be633a5148b. 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/QZFYY2506357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4373ee389e130360cf426c4eccd6a8d5cce5c2963680acc287b9af297176e0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFYY2506360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f668d7dd2c04347037c6d48fe01588056cc3fe875d90f010a48d934ac1cefb. 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/QZMEN2585852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7170f4f938390b0dac004cdafccde25c6c2d1112955b6a06d188ff7c6ae5211. 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/QZNWZ2598304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab3a8f096c2937c554c2025bc03e1c65335bc5dac7937aa696384ea7c195b5c. 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/QZNWZ2598305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d4bfb156675df39330e497cd36a017b53418e7f6c2be4878f2502c428c4b60. 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/QZTBE2533651.