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 0x39d38a75fc0f98d7979cd3b723a301fbea4718724f59f069e3cb9d8d9ab5a80e. 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/c245b375-9294-4933-9965-1138fef0843f.json and https://artists.proofprofile.net/proofs/artist/c245b375-9294-4933-9965-1138fef0843f.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 0x3c02846e8c37d62cd2863515d4cd0c5d94bca551dd78aea22114893002cc9efe. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZES62140871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0304f2711716df1b6ce6638c751bbe9caf23e92c5873367018e9c73684637bd3. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZES62140874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13b0be0fe07bbcaf33830f6dafa1a6eec3739723dc310a498f454f6f63c8515. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZES62140876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9b1398be2d22b1125c5fed696b57d821f264fae18ce1733a1290141e229c38. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZK6Q2117828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482926f54caa5676b2e953dc0d81784387356afe1dff28b043465d5108185413. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), 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/QZK6K2177157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523c8f469fe66bc6b7046e50080402252356523e4187c9221e1954d6dd0599f4. 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/QZNWQ2185377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0726c98f873076e9896d2cf3e41e3ae7d277da3146f141575bbd4b2a138b88f0. 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/QZRP52168148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afe9612cbe583fa4eab2d9fd98d5cb7dc9275fbbc6f7aeae1f354b9277df031. 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/QZS632270712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d42ea99027a670e2a32271502e1bce87c25e5c481fdc792e25346cf038d4cd2. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/GBKQU2275833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4473248407d8ee6ab18523822ced5e3e48fd571aeef9821a64d75ce0dcc70c51. 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/GBKQU2271607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414df092c9338f5d7f914db9453058fee43ce1d721663493ee8a7fac288e2cee. 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/QZMHM2269560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4409a796e756802ed0ef541458529bcc5c10537f34290a0890ca1f231f5770f1. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/GBWUL2348873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ef7494bdb5f3935d6a9734a24fd1c083ea558a3fde8c688a6f3840f44f864d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZS662226145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a4c8d69d42e611916b83683fae96eb09082bc9942b10743e8c6ec459f9a6f0. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZS632206435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd026cc5086cb9b3aa84c75319239b3c92185f7d89c4ba32e0375659e65e8a3bb. 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/QZS642202017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130a6cfd8c3f068f24a4ed484c9046057fe200ed9a7a78cd75ddd2e39f3a27dd. 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/QZS632179956.