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 0xb9e1f9b21557a8c7fc547691b5f3f41083a25f4b2defa8d3cadc31107e28e4f1. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7f3eea5-ea0b-4d64-9e95-fca4745aa030.json and https://artists.proofprofile.net/proofs/artist/d7f3eea5-ea0b-4d64-9e95-fca4745aa030.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 0xa96c389a6d930371ac3c0ae328e7a22335737df7b4f1bc0591c5f9d1df908542. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BRNFS1900271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f4e14b8059749ee72772c1a64a9278ca8e915369c52058ae9f025a09e7b3df. 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/BRNFS1900272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1065f285f6043bceaa4deab6cbbfca9c8cc80b3d1097932289fe22ab5441b59. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/BRNFS1800081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bdb2f9f189adf7ca369cfca1396ef145767d375667fb2886e1c967d56e50f06. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/BCACB2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e04d0c2909f8200115814066257546881ac70ff9740bca854211b9e87650cf8. 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/BCACB2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17b485a491bb373d8a146a743df4b05b8581e89c38979d974d5e455f45e714e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BCKRE2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03daab220781886c343b7f29e6ab9d19cdbde3bd1dcb2bfe6feb67d71293f3d1. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/BCKRE2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d246808816bf4e6c5f85313ca4572210f79dac56d615746dc88e9e340608412. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BX7E52100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9c2cf6c3657970edf859ba8eaf61b5df0ca25ab5302bd15a253c9852102396. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BRW5V2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e52e3927fa729178eaca2bae03e71895b15d3be9f0dfafde6df0a6e5b0849b. 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/BCACB2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c9c0f3ef48dde07886a2fef8b1073b18b6125938026ca0933cd45133df6ec6. 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/BCKRE2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c990f62e226b5d79e7fd73d5939ac1c3ead2b440e750e7d1458bf218535ab9e. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/BCKRE2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92064c5a4b9c5bc355da727d6a66d06bd40694154bfd01005a4cb7ddebfed123. 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/BCKRE2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ebcc13f0373eece4427d53a952b0ec26df3283f34703a2823055f4e4a5b821. 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/BCKRE2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07e982ce916ab793f80535fe9c1b70b3c7d8264b17d47ee7e0ff213d1e0863b. 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/BCKRE2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f3ba639f94eb8f9164d3c60468f41960ffb91cd707fd569cc847ea42e3e5a8. 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/BCKRE2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ea67c9081e4106700d1497834fe1f912d8e0633b26649ad39a35d19de8bf31. 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/BCKRE2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35eab8d550dd6f304a3c5e561044e2663103221de005cf26aa790b47991f8918. 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/BCKRE2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8577c3d2bd7cbf6f923d02a31892994c00b82f48e957cac6648d5605e7642f84. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BCDCN2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9813c05cc06f121cee55c327a78bfd63658f43afedbcdfc0f1d777989bce713f. 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/QZNJW2055388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeddb5af87e8e1b07d305089ccf48dee16d6266cb722647ab1733bbff058cdef. 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/BRNFS2100133.