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 0x48650f8f18d5007bf767d6dada2296c09f894f1d66509e00d97bebb0ecd13da4. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/abb2aad6-d49d-412f-8722-f7b08661e209.json and https://artists.proofprofile.net/proofs/artist/abb2aad6-d49d-412f-8722-f7b08661e209.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 0x7e1631119ea00645408112ac2efc27f8055fde16cc492ec8491e47d7670af082. 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/QZFZ32481768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8cb2c0ed19af373d80e2b3ecb4df94beb2b78632e8c9817d2f5fbf57c958b45. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/QZWFM2492067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd564a159034cfcc7a56f4f3ec18f7688dff4210c5af7ab808284c735420ce90. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZWFP2425400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fa125334db893d826e269455755519e00067b17d0f2dde7eef503697ff683e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZHN92543235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088631e2099b4edd29e27b25ebe0d8a507f781707e235c0814e5308cfc9d535e. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZMEN2549989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a5946cd1a69d6344da2e96eacb515be64ebdbed2f913f932b0808727f227c5. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZZ782446274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088631e2099b4edd29e27b25ebe0d8a507f781707e235c0814e5308cfc9d535e. 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/QZMEN2549989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fa125334db893d826e269455755519e00067b17d0f2dde7eef503697ff683e. 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/QZHN92543235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b0626386674e3f7a2d4fcb816306a070082c3e4a4fb17836e754748157e68b. 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/QZNWX2599546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8023f04572042cf4af6de9d0a1fe69f28bd31c01cfaceb5d9730eb53a1677d6c. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZNWX2599547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab641a2e9802a9aaed897ca9bb069cdb80278f1662b8c6dbb3ae2453e1b36fbc. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZES82544006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174d4df50b6efdfe6b5a0d704d673cdc57bf1060d23d56065a5f63d77ceaa97c. 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/QZNWX2599548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3898dc0c209cd19bdd287461ffa39bf7f350ac62a44e711eba4c9d1e4b27543. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZNWX2599549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf839bfdf0a1235db405a8aab7cc17e96d2862db7e018b7ebf758829af716430. 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/ZA9XW2400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670231642b94f66d2c51f1c368f2a294a415e93bf8cd91e3d20b2d813ca41323. 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/QZDA62404315.