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 0x9f19f3f69f5e492860b7470b53d09aa0fa49f2084921dc665dbe69a2b4e27c60. 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/7be9043e-8c10-49f3-a93d-63c437898db6.json and https://artists.proofprofile.net/proofs/artist/7be9043e-8c10-49f3-a93d-63c437898db6.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 0x8c1a6846c8ba82db16a5158260b208cfc59b46802995ef959d097b5aa7ea97e0. 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/HKC992424622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94591d42930874eee144aca565a8f14e3aaff87e4a1f1673152659b40d788014. 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/HKC992424923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6b1a70239aedde9b68c1f490fd23cd9a806b4148ccf8e81625e2f96419b031. 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/HKC992424585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5816c86d74edcd53007fe74fd2d3804f2bdd07d25276825dfc73597d7fc782c9. 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/FRX762491084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fb222b33c0ea2d6b0923a2935030903a8c8ae648b45188ccdb8c895a6692b0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRX452425929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a1d9a1d63db3bad3889ca1a5447827324dac59e1b0f8d94a5089ac5cce9950. 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/FRX452425959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be71c9be4eb88f0dd7938ba76bf89bff00f0b9df78dd1bf35bf3b506dad80a8. 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/FRX282415447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8d05606c54834228a64e43ee9b0bb55ce380206b49091d884b2643fca719c0. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:14:56Z), 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/HKG731684511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a1a66a89d1d9daf61f08f7ab491c63851b02ff3ba843b64c9259a724ddcbfa. 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/HKG731681260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebdfadc5239492a949323777e14cb6fb1d111608ed7146689deebb8457fe8b3. 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/HKC992325591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abe1db17c4059c267d0a7f514b30165d75466e9395673f1f6ff6e6f604c9320. 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/HKC992325396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9b16c9f273affd76138e9bc26f7c1ebce049975bdb758b338971eded568105. 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/HKC992324679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177b32c7996fc3fc301f89b893e7d6a1e5408d256ab9a7daba85b8c5b6a74b75. 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/HKC992324667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9c878fe3f0b0230324925cb7650c06337398fc5d717fab88aab8ab49b63dc3. 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/HKC992324642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db931d0324b0468f05d2efdf0b014c6f82922882541eeb83caad5caaf512357. 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/HKC992324102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa0de351f0626ec37eb4e56237204c4961702461663099074979cfc6ee785cf. 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/HKG732375027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ea8f9328b62897d01c2391e6034f2016d96df25b066789ab491223e6166c81. 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/DGA072254680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc062307be8d6bc78d6cbff9af4890fb22bbe9be0545cddcb731ebe45dd984ed0. 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/HKC992524406.