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 0x869990b9bf08496c568363d9c5929db0298dce6c3e2bb9bfe41043ca5dfbed7a. 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/c74b274c-dbb0-4828-9575-c862e99860b5.json and https://artists.proofprofile.net/proofs/artist/c74b274c-dbb0-4828-9575-c862e99860b5.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 0xc447de62d997ce34c6500f2ccdde0e1c75090009f61d703c9f698f6887620fc4. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/FR2X42260231.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1d6a89d0fe43d70a4dffd893208e66e147a78590777538104239bf3e41b802. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/AEA142301125.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbae55f11c15659c73f382e6765a8a6f8990e268473637aaf3d58f5c11e34f32. 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/FRX872330022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa184a437bdaa0c90b12c5461562a673ede89c0ed2b110d386a4db6ffcfcb66b0. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/FRX872373565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a03b89cdb5285edfbd7129bd32c8cb7ddf0252b0050d071b10962ea58ed2ab1. Chain 2 (Bitcoin): anchored in block 957957 (2026-07-14T05:10:34Z), 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/DGA052321017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9006e8c8747edb654ac15338aa9f98ab92d4f5c372f2920ee2dcb1aa05cf6646. 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/LBA132301338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf39c48d3cce2d5fa4c18cd0d301a8f84643d86a7aadb4d854b5fe5c9702c3c. 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/CH6542372635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ba3eb37f81bf0503fae151e8c32658610cdc21d49c2df5b37a3a56560c83e1. 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/TCAHZ2468742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1a4c828c1724cc2908ee210f7edcf7011db09d753415c72f75097bb3995266. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/AEA142403182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3d02251f0e4e08b63aafc01d7b7640ef579a6d14bf4b2aa5934c31442ae77b. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/CAWK52455872.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa344a9deaa786166a0bf11a96e59989f85b1d30283df32bbb611d9867301c8. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/DZA102500603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6c01dc777c058723bff6b54ee11c99eb4f70ba05c3c3a3e1d934f4bbacf3e2. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FRX202527295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1e1ba517bf5cc8438df7323f27d967caedd142740f64f47ec2a13a5cdc38d7. 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/FRX282565709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8599cee6d85322677e7baae6508463914c3af99c889e05532b48b51f65c0f7. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DGA062514931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbb264cd337e573bf49625924b367d4cf4ad3c43c332bb7bd79a947f8919a2e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DGA062562036.