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 0xc8ce7af53503f5261903c636566907aab09e5d61097017abb9ee7603867004a3. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6c6274ff-82cc-48ca-8bd8-648331b55c5f.json and https://artists.proofprofile.net/proofs/artist/6c6274ff-82cc-48ca-8bd8-648331b55c5f.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 0xb45bde0e9222a3c338542c950cf6d3422d1691f56679c3237cb1a790e39f8e91. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FR2X42457392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63b0d95ad97fd0d58996a8004b585f6a9dbdb4630d59608c33c7977d1f1d845. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR2X42457393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe255d6f5e3f6a65c6239361229d97cd078f1eb55e5805f8fea249a300ce75efa. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEZC62191726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d36ec48a08ab8014d819e8ec2491b678ae64d0e724056a91fa03525b2f1044. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNWZ2422113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e117bc8fca6f7ebc229a31db863a33a9b0fb65978f703995dee3baf3615f2ae. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZTB52329851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6274beb49988eeaa5849cd34c1f2eac17bca63c80a74cd0e6c1b09429c530a. 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/QZFYZ2468217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1a88ffaf9c2576fc5261b0dd0787fce407d894c3d35f6b3709fc44bdd89e87. 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/QZTBA2339286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d217ca18ef326528fb74861567f78e49080ef922d7d9bf9e769f5986ec8c982. 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/QZTB92320104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e89516bfded38a3c661ad25e5813826080cbf9c5f15bc1dc85974e1629ce5b. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZTB92318373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22af1040ef0d8496ab83ff56a97ab34054754c588a994315936c4d57f4bfbb2c. 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/QZTB92344798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f99e30466981c38ec2bd9dc16aa4c13da5d41addebbc8ac012bc71277deaa6. 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/QZTB82337322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9f5a3f8d5e57597bf31cf995c234f36baf404e88858fec18cf8a3097b81b00. 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/QZTBA2339337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631c40e98194725b66f62d8fb1d9a1543e9dbac3dd2f4a4447715a3e6d2990bf. 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/QZTB92344763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5ea56f473121454ad4d4b5286a44082c92bfa254c6e56a95093dc583b36c37. 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/QZTB92307341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c5fcf007eb67da6a7b3750dce449c276fc0562fca70c8bfdc108acdd1b71d0. 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/QZTB92344775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7343845b78e4d760212cc62f31abc4da9bc4b121dd78c69f46308d6bac12e173. 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/DEQ022009593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae317afc9c32485a6b63f32678466246b93d6e58c18c5acb7b3d394463d06eb. 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/QZFZ42572039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54d9bbeb904f6751b8b72d2bd93104fb1808b1f858450828492b580118ea195. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZFZ42572041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f30b192134d4ecbfcd69ea050025cd05e9a68ccbd9ef54cf99d5c7ffc02d1b. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZZ7R2474296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3689153052ee1202d2d5f42670fb4682402c52b4fb5f1836eb109bdd2861bc. 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/QZZ7R2474297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc621b1bf3faa2eb36c5c48a054e363c82c15b2b481b2ed397f259e9516f0b622. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZZ7R2474315.