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 0x86eda847bd3535e45deac9c452d05ce8c1cfe8a3df75f8b8894c339cede90c17. 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/40bfbbf0-c0a5-471a-8003-a60fc9966f65.json and https://artists.proofprofile.net/proofs/artist/40bfbbf0-c0a5-471a-8003-a60fc9966f65.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 0x2b909e15ffd64ffdc4f347468aab7882857bfeb96300bdfc10189f28628b8b66. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/FR10S2096983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed1f4cbc837fb4d08f443a402042242186ac04db47857b9eb98a490bd1485b7. 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/QMBZ92193092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253cfc2e50e82d244d70ef9e4f09d44e73ba879678e1cbd002aecb55677780eb. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/RUA1D2222284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7018c5f64f934040e2f4212075d28b6e18e808ee8c8052229b8df6f782d7a3de. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/DGA092325525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba9e2d35d3b0adcc54d97aaa2005867a51913157017a6e5656876320c3d6805. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/DGA0H2349537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b7d928b95966734664e796fba2d399cd543a79a15b3f9c9930c149118789f8. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/FRX282418545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b7d928b95966734664e796fba2d399cd543a79a15b3f9c9930c149118789f8. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FRX282418545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba9e2d35d3b0adcc54d97aaa2005867a51913157017a6e5656876320c3d6805. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA0H2349537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa645be2ee97557e526ab874e9707b7c0b13870b785892f627e0456ae7847e992. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/DGA072306983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7018c5f64f934040e2f4212075d28b6e18e808ee8c8052229b8df6f782d7a3de. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/DGA092325525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8601211bf6c94132ecb7b29dda9cf2c4898a43dfc2e3202ba3226205f0aca8. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/FRX872443820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba9e2d35d3b0adcc54d97aaa2005867a51913157017a6e5656876320c3d6805. 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/DGA0H2349537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7018c5f64f934040e2f4212075d28b6e18e808ee8c8052229b8df6f782d7a3de. 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/DGA092325525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c6225a022e80a25ec3c7548f00cff87587f6d297ecda95c03b58c4a01ffae3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QMBZ92415473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13783f2ee0f915b2b8f139d1534230f9e0e8326b3ae8538c152e221ee2e1260f. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QM4TW2537776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872af00f1bb5ea3a02e4e1ba13f810bf3273fcc16d6f576c5b6d8684275f21c6. 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/RUB422104137.