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 0x686c737cc84a3398092cc1a33194ac79c4cdf5aad962ab2128d4e2096371587d. 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/35eb3614-ffc5-4fc3-940e-af62d6c08156.json and https://artists.proofprofile.net/proofs/artist/35eb3614-ffc5-4fc3-940e-af62d6c08156.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 0x50b1674d3fe3acfaa0de377dce3c9a07dfaad9491a23046f8a7515bde3e153a4. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USY280734122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a31e01084317de8b69c51c63c78f63a0b871c20f248b94087347637e2fe516. 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/USY280734128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f071e98c7ca6bd79f0bb7d77948911f4afbda09d466f46cad4aecbae701d45. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/USY280716253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7f597fa27c88b9ea414f05261a678517a921e58f97410a508dd2045051154d. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:24:39Z), 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/USY280716254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129418f549c1c25737fef31c26584bccd7ea61bd6486fa12a54c4d627c9b3173. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/USY280716256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc052e91e818498663cdea3af3f0784d06e2b02879fba18a732253d5bcc6c074. 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/USY280716261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97d57edf841d7aaf947eb09bcc35ba64d0d41ac609c5543f8b985e984f0c354. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USY280714776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb31bb225f9dfb4a77f4f6d657b26ff09d2aff36abedea71fea3d92dc94b6f5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USY280714778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670c5aca3bb01cfe2bdefae9ea0de4c9b30d3f7912446fb34b437672b806ba8b. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USY280714779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b9c7dc4d4311c286ca10f2d7537508634be2f6872b13f9c53d0f50374974cb. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USY280714783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd87becf936625358516fd49d88ccd6f631855ab6e88c1484093094aa7a15d8f. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USY280714786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e1a2073ab27983683c9710de04f929fc8ff5b1a97f1e8eee3804737d058861. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:45:22Z), 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/USY280714787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842fa278c5faeea32839833dae3c6afadeba89c68e30ba24dc1a3da0ec45cbcc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USY280714788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d64487629a91541b7b7e877a720cf3eb0ab578fe2bb257dd1cd166d5df7650e. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USY280714790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b254615d0df25686a108aea32279d4821c88a6423e3b48d074b7ae907353ac. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USY280714791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4c916d41c7ed587502bf3a6dd1f4d7590fddeb504326e435fa136906e340a4. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/USCGH0923348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c817ad918d461f8f6a1301151e3bb582f2932314b1ede8e31908d300d7e753. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USCGH0923353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a9c8110e922f688252ea78fcdfab71df8396c686f1466c273e921d62b5d14e. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/USCGH0923355.