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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7920091add8eaecda526b1c9cde399c835c55bedff52dc69726298de5649ab6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7acca940-ef8f-4a06-afce-511037d05c2d.json and https://artists.proofprofile.net/proofs/artist/7acca940-ef8f-4a06-afce-511037d05c2d.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd187da35b86911884c212d9f3b4b593d1a600378c4bde8b0567493ea6649b0. 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/USA2P2422099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4daaa758aa3c2b41610bd210dfdf35dc9ff49ec82b814efc3ea12558623b20. 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/TCAID2471438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996a1ec028e166d119c11c656af842f0f3e36cfb11326b52a29400009fef5a71. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAID2471553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e1341dedf0dca945933dde838b1ddf59f073951b3383d8ed0d59d6439d4612. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAGZ2367344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c9db18b3ecb4ca9d0b8eb876bddcb8d6def119fafac776884cb4229d5f9b43. 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/NOX8G2400221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33506e9045ef595b92309d0e8e5c52afabec7e9ce7fc39c2d88d9a88acece83. 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/QZTAZ2393232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39a01a5f8320d61ea44c0a3b29c3bcd5eea833329ed06d74533d76a4798d261. 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/GBSMU6345886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172705d3e233d3a5ebd2ed606f80a1631457f25c8e10aa9e3b4bfdc9051d994a. 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/TCAHN2317059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2feca1b7aadce98779c1743b9c90b0ddb2c62db60407e8c5454add9283f1eea7. 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/TCAJD2400692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf0269f8b631553f5ca2d8c346322ae0c5e0672714c370ca72fc5c9507e2f56. 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/QZK6N2450042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d573b636a5ff1f65afe35e75ef571fcd27a3ecd4ba68c375fcd4aa6314d103. 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/NOX8G2500075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212f08bf5e1729178ce79e0c116df23e1d6114ff131dbd00a797cab0bca1b351. 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/NOX8G2500057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3f987559037a29e0487dddf045ff645cb28430b6e2361c8617f73db64dfb1f. 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/QM4TX2543482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c8a4792f938ec4a12920168cc6c7899cb4eb44249b0609615b248209843d1a. 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/NOX8G2400305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93225b3c24d037c779b7586ae9fb9cbf4e4aa7aa41230aed811afa13e1889a22. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/NOX8G2400293.
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