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 0xb43e574d62bb452377c89f2b9b8a291bb782c928fa6c64bdf0276355e8971840. 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/54c0d1b4-894c-4488-83cc-8400609920b7.json and https://artists.proofprofile.net/proofs/artist/54c0d1b4-894c-4488-83cc-8400609920b7.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 0x4beeca448f861352a28d43f2305fee335b34451417281d3ed59e056d6b9c72fb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UK7H21500117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a7297f0dfbf6e35e22684834f4d065aa5907a22d9b9a7dae41decf2d251d27. 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/UK7H21500114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f5e3d69d75930dd73ed7c46bb8ea189a42e52abb2bf1f00c478373fd6489ce. 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/TCADP1835512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f4e63f44c9c6b8153158b43f792521b3e24ef40566cc4119424c81cee9b555. 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/QZHCR1900046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace345d0544aed562e7856ca0558f9ad9dfe014a40e60c6e1dfb2c37edcd4f89. 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/QZHCR1900050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02032dd3a7d2d2418a29cbcc5081cc500dc319852c3b609859356b218fafe08b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHCR1900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a8b24b15b0e1453c8a6fdd9076272203762bef7556a9db7a04a00752b382f7. 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/UK7H21500138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748bd0b51cd74d6dcafdc412c0ea4b82cd279b6745d81e6c76326dbc607b407a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UK7H21500141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09bbb4a7c4f188c957f89549130afbc8000968680cde6c3f55a6afda5cc7b904. 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/CA5KR1928202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78619e1b68e69a9e53de2ec0e3f864228e730ebf341aeda622a3c21d6d672d94. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/NLRD52264092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43393177c4849e5158a6b8a18c2f73f4a00ae9e60351bd705f04e866fde7dbd. 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/NLRD51859905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02032dd3a7d2d2418a29cbcc5081cc500dc319852c3b609859356b218fafe08b. 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/QZHCR1900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748bd0b51cd74d6dcafdc412c0ea4b82cd279b6745d81e6c76326dbc607b407a. 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/UK7H21500141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a8ee72299bce09e80778cac8da9ad1b545ac92e6a63952f106e5ad3d483f25. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/USA2P2472377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748bd0b51cd74d6dcafdc412c0ea4b82cd279b6745d81e6c76326dbc607b407a. 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/UK7H21500141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c362ab01ee387f210a853906142d20add701255a3620680b8bc2d4974bd55e2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLE801818016.