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 0xc8e717356e184556df8252b9af520d6c83a57e29908759b11cb6e5ec4b7b4672. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f1aeca0-79f5-47c5-95e2-5aae2893c53e.json and https://artists.proofprofile.net/proofs/artist/1f1aeca0-79f5-47c5-95e2-5aae2893c53e.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 0xbc055c3e93d37ed5755dfeb051e91532cf3a8fffcaed24fdee6d6d057c45085b. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/HKG732300182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e4cc13e2e90f295671d53c4957679010e409ec9edccf84cc0bb94c294b7320. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/HKG732313950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2be174129e23f6277245e964feae05b2329a1a0cb7ff13ac5f9cdf4627ab877. 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/HKG731718327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abd9b6ea721d469ac33c58846ec2552dd4a2cb98ea4fa6ce8e846633e2e4924. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/HKG731718328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6de839344ff40581391bcead8f41e388ac971c11b2d78ec531a099ead397aaf. 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/HKG732229211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba2feb5fb8e56be607e96e66d886a61fae8c4dc9be9ec9721d2877eb0cb72ae. 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/HKG732028348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4d1efa9d1d94ac132debe74096149f386b910a7b24e85380f190c6fd875daa. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/FRX872150797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7801dbeff6e13543cb80cfe0f276d601b8aef34749bc8ac0d8028912a609be. 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/FRX872150798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa1c6ddcf231c27f71e97fb8b690b07fe2fadec7e91f3df24a6037314f8571c. 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/FRX872150800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b89262392f0b41082f67899d0ab245bb2a2ac561957c4616d63ed937b18c0d5. 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/FRX872150801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdeff5086929ba2000e1dc53500a388955857cd29c5792dc492e9349225f91ff. 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/FRX872150802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b1e23978f896e7bc8178d940b98c49be65e2da03f10ccd81f64c39a1bcd08d. 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/FRX282104942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49086c3857fa3139089eeea0065ffb0a2fcfb265b73d16caa0b9a847fc8f7dd4. 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/FRX282104944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddffe18c76dec0ee145c557c6be9226d91e167d85cf5e5b73438b158c3471d4. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/FRX282104946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf3a413668a1a851e83deeb5f56f32325133746450754b0d99e2678dbc97753. 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/FRX282104947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb92efb0439a91e6a353c628c4327cd095fcc9910efe8fe1ffabbf3deea2924. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRX282104949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21fb82f75f5d3447c40123e59da86427e6cd4a2b92985f17edeee132484fcf0. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FRX282104950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f94fa492ead544b83102bf5d92a3da158bc85ae478c321ce93cecc0359afa0. 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/HKG732146283.