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 0x92b314e0d59ef3d3027cbc44d29b562765aea84c55de1f5c02e1dc00680b4157. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/334984c1-b489-4fd7-a75f-74b06ed06016.json and https://artists.proofprofile.net/proofs/artist/334984c1-b489-4fd7-a75f-74b06ed06016.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 0x9f26cb71d07dc362ccd231f91c5aa45b6b684f2c68874b9976dab679607e92bb. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTB92507085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaf1de072597b52709837d818d7a9a238578adf4ed529744e75b421030eb57b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTB92507090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed053f0c34e050615c88072a3735e2469b73abd051c9b63e82d45e9af673728. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTBA2541705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd98fd749ec1db0b655938eb75bd86a44a890ebcccd7b074bbc073b337fa3f5d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTB92507153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c180fa4c77c8db76bab077efdb30a0904b5df456c946dc2b134f96fcfb71b3b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTB92507155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d93c26136bae7119b8d33df5f4070fb15120ec43778689a6db59d4a0200369b. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZTB92507161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea76d2b800ff9c38490e78b3675820d692d289610850c94a553b9883b31e5c9b. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/UYM120701451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e487c245082a1a2cffb6b63604bfb0a2cf089fa9627696c760cd802cf369b8d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/UYM120701452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9d29a9dc19f28d6ae66510b84a17d985909779da9255541e38e4b8bdc79a6c. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/UYM120701455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd3dc3c8d4b9a1bd02973653b278c2b4d74b6f1f9e6b6e7364425e85971188e. Chain 2 (Bitcoin): anchored in block 957539 (2026-07-11T08:09:42Z), 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/UYM120701456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ed075b4c2ec0928e3278b93c919e5f1933e2c7952f98d6fb8fb7e592d63a7c. 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/UYM120701457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee70071d01ba84450874c8dd7a02ea0a65a7af7702f7de5bfa11dbb544597367. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/UYM120701461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cdcc38b86534c03ac05fc73963713f74a466c75a0e994acd2eddd2627a6ae0. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/UYM120701462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cba620d2911f07feb51ca41808a76de4f477dc58e70fa2eb41485d0d45f3ed. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UYM120701468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b38fe278c48d2c99b84b91290d521aa88342183e19c9657c5667d06da5cc9d. 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/UYM123000345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9d29a9dc19f28d6ae66510b84a17d985909779da9255541e38e4b8bdc79a6c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UYM120701455.