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 0x560df9e159090867939b476a70fe2dadce61bf98d5d14a17fea71ad76f8729b5. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/506e34a7-f30b-4e8a-93fc-560fa7a007f3.json and https://artists.proofprofile.net/proofs/artist/506e34a7-f30b-4e8a-93fc-560fa7a007f3.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 0xacb8feef6d4c39c0629411cb416cede2daf5e583f58e9d9b6e3b0da80a0a07f0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLJ2H2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4835f50cd94c4bca0ccea63a02e16068038fc251d4008dbc4be318b81c9841. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLJ2H2300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2522a708d4985af4a1c6fbccb2bc0b3bdad5fec567edead49b5a4b3f58d9f0. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLJ2H2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc2d1791df08897a1a1a561bd7fca5fc05af8ec6b6cdf238f73d1c4667b8bf3. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/NLJ2H2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2945549a640551444ddf2c595ee016c09fb4c62f7a2c90424dc0f9ee14864b24. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NLJ2H2400008.
Nog Steeds Hier (feat. Seffelinie) - Extended
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737375431d8f4a30a9f44d0a8e43bfdc7ebe3685422e98c983a51c0d0aa1ec36. 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/NLJ2H2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe800d57aa1a62cca8ec63e13bd3601631fee4d0235168ced5474cf9bb490b746. 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/NLJ2H2400010.
Ossenhaas (feat. $KEER&BOO$, Fano, Eijer & Harper)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ea69d63d42d7991f9c0e1660f3639a8ca8a79f7712345b8c4537b46f864ac4. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLJ2H2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f442f6ab724a7e779a0b9a4cac957a735e1c43d1b6657788a19a15777a67a6. 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/NLJ2H2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cfc3895c97827b2cbbc939f5511c2c487c316614562478178f9f85b098d0d7. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLJ2H2400013.
Kampioenen (feat. Ferry Goorden & Sttrbstn)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5031e810d186a6da12c31fd206d7408403527c34b823161c26b0b86be65c67e0. 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/NLJ2H2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ba43e9e1469408ce0135e9a73b9d0ddccaa6abe9a76e71c13b5ff240fa4e06. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLJ2H2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4b5bf88cd3b2f8a33806efccb9b2f694c365bda7570cbad8320b031e2ef7d3. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NLJ2H2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37eede1bce49b988168004030602e00ec114913856b8d3e71753e3c25a471620. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLJ2H2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ee668e810f38c2ea6991348bf03eef0d17a6bf80add842be8cb2007b5196e0. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/US38Y2590040.