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 0x800e4199a3fbbc24c92e47add63b2317d61212c3976f0ce7a672d44d5aaae336. 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/8e793bac-732a-4ce5-a10a-bd5b71c2925b.json and https://artists.proofprofile.net/proofs/artist/8e793bac-732a-4ce5-a10a-bd5b71c2925b.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 0x76a70f52397c2ba4f61bef205aae1538a9ebd1f6771f23c991f276d93cd8e2b8. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:24:23Z), 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/USTC60860879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139a5efddde709e0855bb30d96ebfaefaaba1ad3b7544898acabe01593fad3ec. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USTC60860902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a15b6ff3458f44e5832e0b11e0929691921ca847259120f55a1d1a0eb44cd9c. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USTCZ0959833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498a48ef5f621edfaeeb35723cbf639988dd1e3e834a3b2176c7ff7a86fbbec5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/USTCZ0959839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x741227824f66aeb081aeff4e9462532ee63de474cd023af39b3733396d2b0f55. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAAS1090264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352cc60f9fe55f44f6f7e0db688a5d328af29a259d7898811d3c90de6c8a6d3b. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/TCAAS1090265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd533593ce3df328bc5729edea2f69f624ca15f72f9afbea74e8d1e5f44fad403. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCABC1125525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f911365c0af95f8453ea328c8ec9f2280057fb68621143717917a8f64da980. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMNPF1200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745de19827c214504434d6061e99c83a637f6c8e0789034cf8bacefbbc61af28. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QMNPF1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165ac592b5b3976efe8f4a8791ba2778c7258b7170239e26df6a45c3d99c46dc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMNPF1200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1357f424d7da6e70d0f6b829ad3da8851fbe49c3ca36355c2a0cacb66f6ab1e3. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QMNPF1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236a6f7fc9d9b314e27c185191de1475ea418d8d14ff78a747efa4c85408e317. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QMNPF1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e95ef602c99f67f65d0e09405e2f3e490a4ffc58b588cfeff38844e44618f7. 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/QMNPF1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6795a1730b7a5b971a74d3ac5fbfa0f2f93c5cb87e3de4df4c80e3c8564d97. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QMNPF1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48760666d5006766f6d482dac4c9f7e9b2ec6bb5e10a7ff7482113a47793c7a0. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QMNPF1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822f2c379b6393bfe948179a11ba980372b5d4902bcdd3634e7564451ddf00ee. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QMNPF1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf936f6ee96ce667086e7d34153d4123c2db1ef29c9a25c0ba7c510ef9077de41. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/TCADF1782345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc47bdd5b52a712ca6ac93858194fb3fba00484e8a371668d0f1d75d3a01cf5. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QMNPF1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea1f010d2999792e1d87da52a614f2ac722a12f8c6f62f0b51d92386a0c60f9. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:28:47Z), 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/QZFZ62078083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a62ed6cd6cc7f32fcece808365aa609de8697545236636606e7dde150c0828. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QMNPF2100001.