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 0x930fd4ab3e0356730f73f06dc036b1ddb31771ea6088101231a20cbb9ce96a00. 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/1023820d-ed64-4682-9ece-7525ecbb3f66.json and https://artists.proofprofile.net/proofs/artist/1023820d-ed64-4682-9ece-7525ecbb3f66.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 0x62e794c8793c318d23432f7402c6340f22f5ce6cd5981a614d92f9cc75996dc3. 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/GBLV62122389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2e3d4a80b763d7126364d3e6602598a6889c46079ce324b3f6f49526d7ac6a. 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/GBLV62122392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70cac8ba0be2441b375949f89ca225d5ba7d5f6a2ce8fe247ee86be5421122bb. 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/DEY472378225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cfc857de91c05ba734439e191d3cb126bee32e292776223874ec87400676ce. 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/DEY472378226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ec005031e02b1babc5fe51a3257f3cd69e2989e52c0c1ed457aedc5e901404. 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/DEY472378228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43820906a8a9ab27e4f371e5f9ce787252e3c5f583a1ce9b5a482d0d9dd5675. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEY472378229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14643c18821c1e5b4eb60e4b1bc2f7fddd03a9f7585d7369389008ee9ed6e20f. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DEY472378230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31805cc878efb2ffbc6b1ef1653139733f918f7ef478a60c90afcbc88b799368. 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/DEY472378232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb4b9f86ee9b073535323615151e84c72f33270bb1ad3b8c1dfd196cb02d5f9. 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/DEY472378233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0036f1239149219119024f04efb58fe516149e3360410ab117bedfa6cbf530. 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/DEY472378235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eef92318d95e15606a35662facadc51b9580204a8b5033e09e6c002faadf4b8. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/DEY472378236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc000b04e9c8b62a876a7cfbbfc8b0533e734fef1205a3a8cf461621db88f14. 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/DEY472378238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28ba17cc43c347877f438bf29863447ee150ae8f6a55dd81c31bc79cb1def9e. 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/DEY472378239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79daf8ba638ff851670bfefd38784361c938f1c4ac700cefeb6474ae83a3d2e2. 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/GBLV62025272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253556d550eeac90c343f2f8553094655530b1451e6e4d3419fa3aa58da15b53. 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/GBENT1666576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4e5324e79ea584bfe358c85cd5fe2b6e2d6d965252cc47466278b851bd8cbf. 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/CA5KR2149849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa523273d36a89a2824702e5a7a82ba76c05df15bb7127de1efb24b4c1567705. 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/CA5KR2149850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77975a76e26b87578e608b9076d07295ce47ca1a6874652eaf07db1201f96c04. 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/GBKQU2396880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f88138ea6e3b987fc692cd3eb1f1a3e2f9893bf83d9ba066d923ed0dd9a21a0. 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/GBKQU2396882.