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 0x1b74074ef2e6db70be23b5e5cc03bad5da8325f7c74c3225079d34dabc9a178a. 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/eee5ad99-8de7-407e-b21d-b9ded4b19324.json and https://artists.proofprofile.net/proofs/artist/eee5ad99-8de7-407e-b21d-b9ded4b19324.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 0x7c1c228e327e13e181f5ee4acaa30aef5aa1a9727968934931b0cf5eead3e8a5. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CA5KR1974778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c1ab02b043f8ed55f854b574b58f28ef88420fe9371a7ca9cdf6a94222aa1a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CA5KR1974779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d98456f102fa2ce6a5c57d32a3af3a34a378897be20abb6471af7d3c98bf442. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/CA5KR1974780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbe49226f03874abdbb47da75ec28286d57dbebe148db27db3ae13428514011. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/CA5KR1974782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e44792bf59f0bb92d5bccc67cbbb1b040f316447d48a3a8252e6df1ed0c97bf. 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/CA5KR1974783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90748a64dd572818afad34347c18f00ed75186e59413963bbc39f3c9d2f9127. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CA5KR1974787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c47609c85db7e93b431e1fbc279f66dee5f1ee5a7dc7eaf901327f8ebb0063. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CA5KR1974790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0299d878b341a8b54d1045be06ca53ebd4acc7d72c417adb66ffb90ec0165ae8. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/CA5KR1974792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84d9ba5ee2b35de8dc12a90f6f49b61772d92be5ae8df7eda6b6d4d1efaa7bd. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/CA5KR1974794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388d98132bb0cf260822d78437b2671571720340f3d447664a3274cbd7173b39. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CA5KR1974795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f25e33462f8dfbc2680f0396d6145b18e3360c7ed97fb58d578a309c3071fd. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CA5KR1974796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90af33f686cba0a723a87599e366806f76540000316037b340de0235437c62c2. 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/CA5KR1974797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42973f4a4b3d8dfd08504b636d45ce58df802e642492652423b8bbd5e60f5b43. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/CA5KR1974798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1622413ea2b5707457cae823d60d3a9a5bd5f9166cde5af1e48922812820128. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CA5KR1974799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7445f1f46ca6088310e6998f15cf62320f283a586dfb9a7a19e1e98fc23c8f0d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CA5KR1974800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed57f905bfe608f7daa087d51afc11f1a4df8dfde9a31743c54a53e78701344. 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/CA5KR1974801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b05d93c9415515f8831a70f899237aebede1031b8b7950ef0053eb3a289d046. 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/CA5KR1974805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fdc319b0dc1ac3cb90d22e14a8f3d4968e40fb68e41e43f20add33feb61d63. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CA5KR1974806.