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 0x39d150af12e8ca4fc5b0da4abf13a1c9512bdb285ffb68dde76cc6ce33cd7401. 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/9c6d446d-3c9f-459f-8407-a63f4c1f937b.json and https://artists.proofprofile.net/proofs/artist/9c6d446d-3c9f-459f-8407-a63f4c1f937b.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 0x004dbbefbf4f72fb896ad05165be200fefe927169379750cd40d7ce7d096cb22. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYX2473262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64d1ee008c7cd973d5b543aea452ff8b7d7352eab6407ad49684686abbbf4dd. 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/QZTBD2347689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac828065db0971f509fc6813738e7d4dc6feb265145af604ee1cddb99756d0ee. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFG2313564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f0cd65d2771c14e3acee306ab52d34da24f9babca4975698a184051616c7f0. 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/QM42K2326993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9edaca6c304d1fc772a97e83eabb639d9c42d8b8004ce6924bb727273a69068. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM42K2385538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6a8cd319e28dc9c134c60d457ac9ff48f10ee7f7ada628ac2cc25deb5f24d7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMHP2300425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38eeab74ddb9415042dc2e721ce2143231ef6d0603c9d94405a163fce3c8a64. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZS652362524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb06aa2f6aa6f2ff07505da0414c595e42d0dbf48418ded53ed874a357f0560e. 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/QZS632311505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c587c29906c25e44acf5e82f958ffcef24501c83a28c29615c0ac3ea9957bb. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/KSA012315836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d246c9a6da0cfd1b7f8c0eaaf59bd2b06ea8933c5fd6a9d747c965e2523341a. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/KSA012315837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0616f12c0d7a7eb494799f4eaa9c2c28a9edd2540df51828dc9f1702d24457f2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/KSA012315838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fcd9466434de5fcfef1c119819ce7ea62a4b62f34b180f00238f30f89c9e862. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/KSA012315839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77de7c1a869568a3343d3f978bfaca06c2cd68897e0232c19bc3a6ca37491f56. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTBA2269057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd7a495545cd6f6d2c4df4835204d81252bc5b9be99ab8d7315d6b2686e7be9. 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/QZJRC2227322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf378bed95d8e4190fafa3a2c3eef266f737796fe4693f64bf2cd0c91ca578051. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZTAU2342603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304d89cd48eda16e5d048784224d93f74d7fbe2a272aa36a6f20ecca9b49eeaa. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:06:56Z), 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/QZHNA2329301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5199c7e8dacefb57434533e1e2f2b1c271f1fced1f802a8f4c8699a44df57ce. 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/QZMHK2525189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18c7ad4c5d9366e43c1eef8616f37f5d2c90fda2e560e4cb76623437a953ac0. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZWFJ2407912.