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 0x7dd51403edb0f5866b71c55f76d2a626ae9c8f23359b1d0a78f3c86e358c663f. 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/f2bbcff7-a709-4e30-8a98-7fb9dd8eb895.json and https://artists.proofprofile.net/proofs/artist/f2bbcff7-a709-4e30-8a98-7fb9dd8eb895.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 0xdc8a2608e06388d432bf58d38f99a5321485dfe85fd53bb0e3277534cde884bc. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZK6G2276483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664f3092fba3e125bdb9e23c8d70878835e13b73b0371bbe15da01e5a43e42c2. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZTB22273849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78417ec9cb18ac439c912a17ce460990f9303c33b6dc5ffe899d834950c7181. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/FR9W12412017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02f49e2668bfc92b02482dc5bd33990cf2950f70054fa8fa7720113da9f1a9c. 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/FR9W12455233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b99c5799044fd01a648f1b8650bbb0ae5a232590ab4498e396d7c456aa50e0. 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/FR9W12456182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd750261a938182418e38c5c6b4dc67a96dbdc093d616735dd2c6e611e0a199. 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/FR9W12456177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6240f6c1454b400987e25b4ab09bfd6e580a2e1a98987c9da10c668627862775. 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/FR9W12456180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02f49e2668bfc92b02482dc5bd33990cf2950f70054fa8fa7720113da9f1a9c. 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/FR9W12455233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0212dd9fa55d529b9849ae64d21d917b771076b7d133c23e74676904c57343. 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/FR9W12456181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9a4b883b63c93fe0c3610b2e7dc851c0565eab06ed36724a1a5364c011a4bb. 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/FR9W12456179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab31b08a797814416e6fbb9264fea684ac29960fbae44ba1c37a0e160da561f. 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/FR9W12444629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e23d2b439259e34b126e0a91fd119365bdd028e3196ab818558444e8e2179b. 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/FR9W12456176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81da7c5eb71689a6bc572cb0d2a93ce127969a5d95da8275f28d70bf864f317a. 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/FR9W12456178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2f0c889a998490ba9f82e8561f9b9e87b2eae301b94126010a6f87b03a7711. 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/FR9W12366277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b7a77333fcf202e8759cb261ade33ace9cb6e3a6f9092d4a505cbbf49b286c. 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/CH6542314253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9733332109ff6b7ea6938147c872b900dbf14c0d37294567377c86c63942ddb. 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/FR9W12459137.