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 0x1f481742fe181b7b299d700d219ab943216109cb8c8117287b0f20e81307dcf1. 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/25dd5b28-7314-42b5-911d-eeaefc53cef0.json and https://artists.proofprofile.net/proofs/artist/25dd5b28-7314-42b5-911d-eeaefc53cef0.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 0xedf18570b5efaa623fdbcf6bcbe62b7d4e432e0da6bcea62f7464b3b1d818362. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZTBF2380498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb205aa4f9276838dd8df40e699f0566d9fe66a0853384c315ced13d38532527c. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZK6M2360005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff0a7d1728f7a00ee3a3c4166a25d3e05a9aeb0dafdd34047faa3cd6f1e7f77. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ES75E2303623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1e30527f494444a359c7e994637504b06b98ec9bdd78e7fa83f109133b3ff4. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZK6H2232838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a10a15ed40ea483f80aa573d003dc7ca716fc3790c8c508681281711bcf88f8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZDA42262026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822f323cad302912ac693e16f65193d2d9fddb92c52203a1c4fa8fe92088b20c. 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/US7VG2277937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585ef2f210058782a4a94b4039e44b14c878ab811b208b0f8039f27ef9ea2cc9. 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/TCAFY2188177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59b5f9734856edc34fe07b7fd15e34e38858c2b18bb31e849245975255e483a. 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/US7VG2125080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424de436eb4bfd69144cc9ae43857b5e6aabb0603ab5f04766da78fe30e08371. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAES2066119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59b5f9734856edc34fe07b7fd15e34e38858c2b18bb31e849245975255e483a. 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/US7VG2125080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5d4483e8f7f0664a8354e060c5122f63edcacd130f69b7552397c347b7206f. 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/TCAEE1917220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cec3fccdeee7f2d6d0aef328dcbc5d6866d2a998b0c981125e4cd1dfb78d8ac. 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/TCADF1744950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6b6a853a361e96face8a5e52b088a4aa3df8d0d93f4767f043e26b154a12e2. 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/TCADT1868294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee39a765cd8dcd924db6e3a9461d5bfcba3933331b323c92c263392e4af72e9. 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/QZHZ31978370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31901fdbc3843fb52e7eec2708395e23095d828e4f586737012264be52f6c7e. 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/QZFYW1959242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x290dfb30ac032dc1d84814400e49f5096a425570a65a191e6f4f315e6e08e7c2. 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/QZNJX2081746.