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 0xf78b6a53881c70e6cc9b6a0314faf00d3bf40ab383a6f3233e7d4fa9eaf01bdd. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a93a25e-ae31-4b29-b88f-fc199d5d9151.json and https://artists.proofprofile.net/proofs/artist/4a93a25e-ae31-4b29-b88f-fc199d5d9151.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 0xc376e589f7f0818ed575496c047fa24f71b3d0ac60be8d0e14c3e655f03cc582. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZK6J2127888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60bdb86c0c976d372cfa03973c80b53b04f8be15819b0e413f330fab026e62e0. 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/QZPLR2382792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1355ccce140ae1cdcfe6964922141e2a54b3fb44e940b90376df9b9cde6da5b. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZES82073616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a6bd8feb04afc340d197840f7ebe756d5696ec7df34e0af183b329982ddf32. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZDA81867008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcaf4f13c4c54bb127933a33a9d2d8f09cf7ee019dc9163632e521bdb8b11e7. 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/QM24S2305862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac7d67bc42aaa8229ec9bc66dd3ece6eac9aab2689471b4d1538e3eee108843. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZNWX2350802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84df95264e391e75f60dc53d52768b78874b2d11ef7941219d89faf651ed3ad8. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USA2B2316525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d4ac71a17edcfb960240658ef999c947ba13e1f11f5485be8855208252f8c7. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZK6G2237140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b919881465429997579416f4e34aa4a42bb110086788b098ac3321bbeb9c32b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZK6K2389703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8243eef6d6d88643cf2da0502a4174622871a77f766e1ba1143529f7ef367e3. 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/QZTAX2293121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5feb7227ce0bfc808cd477a33ad4887dc5bccac0a3fed57bb9961cd8cb5c876. 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/QZMEN2360784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ca3a656c2c2fd65a9f9a9dde20190c9ab75a4f4a22c9a8c19819b0065bd803. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USDA12308423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630e14462de69011bc274f419d4552bf180112a76ddb536a343b4a37d08cddd4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZK6M2357335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4bd1a50ffb3d3f6584fc95eef5c9c0d8e7c1c9062488eacdf98fa38357472f. 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/QZQAY2303985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae034fd9e827cd20cc601512a0f86157cbe19eaa0274db7c9af681d1a38eb7fc. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZK6G2348197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192a7d4b0f243b9272b9a72cd3db4a2f366a7cd4cb7349295fe231242970dcc2. 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/AUMEV2149775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713234546001ce82f70eaaa5cb884335ebdec782f9699c8fdadffc09859c96c8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FRX452144327.