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 0x013edc563373ea6546c0198786874f488c025ac474e064630ba6482b66e05b20. 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/f600ff4d-361c-4204-abe8-d45be73b71b8.json and https://artists.proofprofile.net/proofs/artist/f600ff4d-361c-4204-abe8-d45be73b71b8.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 0xf984f2d2b6c19d024f0dba9d041df54f7e02189b638828efafc2910acd212158. 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/CAGOO2462518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e61e46111432036144bc4e3d0969436042cbc9d0d03d53c8032a1acefc4c781. 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/QZWFQ2442205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82b813994408ad3f81a314e30305db9c5494bb81d4121ae022aef15fb4ddc3b. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZZ762462243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095ce86f4ee544307c793f2f2c369646fc3fe87219839cfba94a6677ff2daad0. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZZ7M2430909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9180a087e08fdfc7e67c753ac63a0c558203ad6137048721bddf0a55e020418. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZZ7R2455805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a9af801650656aad1d2b027e3d738106f58116128e2f4157157aa98e2af4a3. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZZ7T2412355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cd98cd4671b3d77db0bca467e05f9a31c4e61bc4c0663ee804c78a98741b7b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QT3EX2450512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b4db3aaafaa04a85b777725983c09defb0e5ee271392d3132dd7fbfd004f10. 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/QT3F32472351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e629aa2488b3e4aa5ba06c4532dfb4f9db15e77ac34d914877a0f20d3a341e. 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/QZFYX2575847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fa2a31e11a3c5f374058af273b532a2e60b2caaf574e75aaa9b8ec13ebf888. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/CAGOO2488549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4703be288d180a3c06b2388fe1c09971a87414732020dc5e472c4aecf6da3e. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/CAGOO2498944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8be6d7f6fbcf8d82037f44cb1cc8e0122ad750f6506f3d6bdd04bb1b693a02. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CAGOO2442589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef04ad727a8fb5f2ee291eaedc81999a68ad7b83d08c3846b2055a177d31259. 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/CAGOO2458971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594b093d1f090bf9d1ec1c5b836afad099c096ed0af88f83da7791eb0eac2742. 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/CAGOO2458973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fcd8eae05889bd3d1973bc679e0a195d40e31464e823bd5fd8b04305281af8. 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/CAGOO2458974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb610cce49a272e0eff798ec71d65cd3d8fbfb75018423332cd13c71e36bf729a. 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/CAGOO2449504.