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 0xe86b4678569f1f2cae3283c2df47fba1cf64a2e8f0e2210aa1188b8b671cd2a4. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9cb279a9-d243-4ebd-b550-fda56985cb4a.json and https://artists.proofprofile.net/proofs/artist/9cb279a9-d243-4ebd-b550-fda56985cb4a.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 0x716751f1019113c7f385cf3e857de339f6d1107cf204e9d05c59eeae4a04ff4a. 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/TWA472330011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f68e95abc274273bbe96a38ca4b88a734c041f0cd2b59ac0caa37e16042cca. 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/TWA472330007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece8590b50bc05f8d1799070cd0c13440c30c8ba0c88b17c67baf7293884a241. 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/TWA472330004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe867a41365e53c95cac8c67d14cc05e9d18f88c9c3fa73e8700285924ee6ef23. 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/TWA472330006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d3c161dc261128e1771263e3c776e1738f2976cd88e3c2a7331cb80dd9869e. 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/TWA472330009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa410395742f007bee8e80784b31f988d1a048d86a2d81a6624381cbd64c97470. 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/TWA472330002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5449549e256d55fafb028aa769fc59e64e58072ca84aa93bb6b5b2b65d85c5. 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/TWA472330003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce78dbafd08672b59881d65bd594f1fd7e99edb5d7b8efda5cafcb6a2bd4d966. 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/TWA472330005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad774df87b423a332d2351fc5d36cb9dbd56e902a8a9b55e796b4bbee1fd816. 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/TWA472330008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceeb003fc79cc49b3724e4ea42df58a2b950c1e38158590acfa72ddc25b541c1. 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/TWA472330010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9d6d8961f1cd19e153aa53f14e8c0962fd9022949e0097e2a73206d477caeb. 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/TWA472330001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceeb003fc79cc49b3724e4ea42df58a2b950c1e38158590acfa72ddc25b541c1. 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/TWA472330010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72149b9c204a51b3d2765c22408af355a3b6f23b7090a8f04cede768748f81fe. 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/TWA472418007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2394ceb6183b637c0cae5ed94ddbda0294ddd7e49a6f2b60b530e2ed7de88f1d. 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/TWA472336003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce78dbafd08672b59881d65bd594f1fd7e99edb5d7b8efda5cafcb6a2bd4d966. 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/TWA472330005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b158464840021f1b6984b5c7aac7064f245e88e0b5a796bd0acc9d550e31c2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TWA472336002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6d263f855ee175bf098a16d9025620c5e857d750a7a314a662e2b9c9c67395. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/TWA472236001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2a0f1ae4708316d367cf4d466fa0fd3a3e52f17f0bde2eb2a85e6714722e46. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/TWCC32005062.