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 0xfad9c7e299765c87ce5c2a9a18bc3436f1b38c2c0351b4bca833445bf08c0d5a. 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/ac65d03f-0120-45e6-880b-54539618c66e.json and https://artists.proofprofile.net/proofs/artist/ac65d03f-0120-45e6-880b-54539618c66e.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 0x6a498210ac27d1e849d8aa82c7bca702c76adf12c167c57b431926f8d8664136. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TR0500800378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04ffc4432416089422419df412dd6ce93a6ad2450dc1f95c1aeb0e958d68803. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TR0500800375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1e933aa766837da43d8ebf23bc288f869528088d3067a78a99dae4d5a277c5. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/TR0500800382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc096b608c76dd43c67da3c250464e9cfec0470b7ac2aeefa388202c5c072756a. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/TR0500800383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08519a806e090daef990dd620cf82540851b96b7cfb71bf89043d594e47ef321. 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/TR0500800384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a3b8eb490cff758bb6b91554f6bdaa30b3f8cb56933786516a90e921d97869. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TR4591202739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb038d78363d91c4fbd6cd0c65ff623dc1e793d4e805ed446f535f45587fad4f8. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TR4591202740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e49ec37bc3f0544499a7626d6a4228f2e16d179ae7071e4c00812b6cedb2ab9. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TR4591202737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1f760bcf2a7390763181aefaa77fb7a7a6f870496cfd96c4140fe7a294496c. 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/TR4591202743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e49ec37bc3f0544499a7626d6a4228f2e16d179ae7071e4c00812b6cedb2ab9. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TR4591202737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e772f17d18511d85a53274f5921f1c15ed441b9c3ea3c609d7c22ad2db9c973. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TR4591202744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508521b17ace6c67b9c1d4818a796b3b7ebc5d7fdaba6197428a22a4a0de20cb. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TR0151500741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cca571a4140bd5e4aff2124d9b71e75b6b4a73a2e087dde99660a1a83ccd06a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TR4591800262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd299706a3578d1a7c9bca1cbefb235d0b882eaef878f6af3d49fa903bb0b2011. 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/TR4591800264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40082ea0e2e3063c9154e3db00c280a710755cc4d00e993de6d5a7f0da04e7fe. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TR4591800266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cca571a4140bd5e4aff2124d9b71e75b6b4a73a2e087dde99660a1a83ccd06a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TR4591800262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2b90e8bdd522ef0ce7ff07888127f85f64c1c1d6b24f717df92764a97ad59a. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAIZ2433043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b0f32ec6ce3a481b10a3ebeafb7119a5a9d8640bdb94c5754d8f02fbe27afe. 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/TCAJK2539564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10270fec0dd17134485fe3d80e5f69b197f2a6c651c73c9b79891e59892eb7a2. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/TCAJN2500230.