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 0x051898788a47da008a9941c479a91428ebe6fabd87eeb2c0c53324a8c059bd4b. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8d4abcb-1bdc-4d5b-8ae1-c200238ff613.json and https://artists.proofprofile.net/proofs/artist/d8d4abcb-1bdc-4d5b-8ae1-c200238ff613.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 0xd0ccfda92fc2077de6848ba5ca96fdf10f84bfbda7971f94c0fdd35098fa0da9. 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/FR10S2185094.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e4c87f4e9ac754edcad3bee2206e2c97a243283b5ea0c0de6c8cd0e26b6b3a. 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/FR10S2185246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649f551490c773c234359678e31af9969962f3f0e635483a7db847180be2cf3a. 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/FR10S2185369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183417e364029fc7efc9176b7001249254c5a41c74587973334845c2252d6461. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FR10S2185060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab425162eb86f6e1a77f0619011ae237e55f2b0e5ea13391794ce481e885ef36. 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/FR10S2185343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d0933d8912f36be79cff416c1efcd1f9831f5ba1edd2f9bcb544c3354d023d. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DGA072109816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53f357bcb6d98382868bb824ba7256ddde3d7347054462fff0d4019e5900f4d. 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/FR10S2191712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f16de7358ee5ee36759be2e000e985ada792b5bbf762647fa6724a251f9f45. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/FR10S2185431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0abbaf9190a1f7c7f543738dccfb700f6c1bccebb1ca41d79223620dc5091b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DGA072109824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a28c5b2406b8c72ae6950c0a3265eac8cc24575bce0a46911e2c248bc379604. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DGA072109822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2184539417451c3243bc85590a2fa26910a931822f4fd435083fed06f5ff9517. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FR10S2185161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52113d61f641a3fa3fb0f9139e2e2da9d0a0633c23c43ec41fc131de092b9046. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FR10S2185167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa85b5c735d14db71d6ae3ce4564badf745d78747516eebf0fcdc6ce8f288c4. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FR10S2185427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9570420609e2922b4b4e6dd22bf9c0738d30251bd9f9d9a972a3fd81824187. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKG732041646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb021fa33bab911375f524f3e9ad362b0399b768a41f27fb14f77f6d25f83f4e4. 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/HKG732276420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9854c98c0157b805f4acc29f877502aba7dff9ab61e055fc00cfea1ebfa9b0a. 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/FR10S2185226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7635c3eea839883b3183b18c0795c8419d536b598619d23989aebd9627cff1b9. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DGA072109793.