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 0xbfc4c6518c8a69f625e598b57fc13359dab8294f9bc0a5a991cf5306bc900511. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/129dc1bb-f286-4ef6-9080-d71a7c0e2193.json and https://artists.proofprofile.net/proofs/artist/129dc1bb-f286-4ef6-9080-d71a7c0e2193.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 0xe4faece45d8f3cbbe3b3979ac704d387c5e8fd354500b118806f34bd68513bc6. 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/SE6SA2328320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e800c067bca5dbd56197a5152e4d8518a4d994299322acad26b2a06dc5f5f16. 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/SE5752376019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e96c59e7365108edf0f817dcbb0c13eecb306fbb92408ef2b7bfc07d57999e. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/SE5752376020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279a15dd31470b7b9052429797b122e13e3768f0c27781c6b11f5ef478b4e8f1. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:49:12Z), 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/SE5752376021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71a062f1fc3bc7927e955083ad12d9fe3720ff1988d6de4817999b4a7a1321d. 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/SE6XW2200859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9658304223b5ecc7f8478f082e74383245ae4f3819d670c0c856bfeeff586328. 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/SE5752376022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4c81cdf5399b206952d54dbb594af7cd79bdca98420e273928bd1d60357884. 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/SE5752376023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805f57c3ad37a3ea1e171767744089e78bd65fd0271dd78ed6841e4344508040. 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/QZWFG2390258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad62e57cd3ebaf90d4539ac718de3531e3dbc92f112674a0b76ee78255c779a1. 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/SE6SA2363461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71a062f1fc3bc7927e955083ad12d9fe3720ff1988d6de4817999b4a7a1321d. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/SE6XW2200859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18bb0ac493877457c84cc35f722ecfdd1bee52b2ca68615fd6b2f6373ead2f88. 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/SE6I32130397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ccc336cb1db74691cc586bf04d1cf0693d500f4297aee62eade4c7b3944df5. 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/SE6A92001942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf1a2e2b5f67adcea0f96caf4237a31acbd2d3ca0714b920462d9b09093a8f5. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/SE5752453035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23225abb3bdbc236e6c7d490f2fa55b3e98f22ac3cbb0215c4d6170125101caa. 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/SE6QE2470056.