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 0xeb30d91b24f9cc1c6224c78ac098d670c994d5c969e9839db51c6a2ac2a70546. 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/fafddc19-435e-4dce-9ed5-81b6a881ed65.json and https://artists.proofprofile.net/proofs/artist/fafddc19-435e-4dce-9ed5-81b6a881ed65.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 0xc1a756efc7c075a8778dd320b012fbcbb4fdc16d3ef7a3f373c8e8b7ad953127. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZK6Q1969425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0fc7e3d191252fa2464ad2a1c3c62562f8d37b10759b3cd9784a3ba5dde32c3. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK6Q1969436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0ae410142ed8dda84c8586c98df6c1e64fc233d21f629599007014393a6976. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6Q1953827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2616b9ae432db4a48e559ae60530b2a73e7c3e278ae77531403189261fd6cbe9. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZK6Q1948509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea6aacd209a80305e6588089334b6b70975577156d31ec6088f8fe5733c93a6. 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/QZK6M2094781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3b8e635410cdd3e215f10141e4bed42a4d14caacdea9c637698ce0ab6c65ce. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZK6M2094782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268cbe6c8a27e233193bb4fa8f3107904cc7a2cef486e6f9bffdf9d6bfd6e163. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWV2038670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516d208772fb37dd5080d657fd04b4e649429439ee41d405c6b2782117845b6e. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZES52220124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a05e9c8d7a5879779715b699fe805e8e9bfa7bdb4604af7c6cd4be3f97d3f48. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTBD2325250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b600bab16d23059b7b0a8da1b0c9cab133487e6eaa7ad96e93a3829bed6f693. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZHN82416632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44ef0ddd0463e546b2980c1e734f9e09ab1977bc5197a4b99019153987f07ba. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZNWY2494258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59278f837bce9f0438f89828c905e7d209338aa46a6bcd413c3f99a8446ab2d. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZVEM1873764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ccad5ec3f65eb73a211e91a78f6da08388ef97ab33244c23d2b18fbb5ecdc93. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZVEM1883483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd0327f8d622b9011e5e04605e2f39872aa038b47e6e72573f77bc77c997506. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT4K32593001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e59f67fd0711e8825b805ff3653745fd8b39ce224e565975b06e0f3b9db41ed. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QT4K42578487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc078f71e81380eead361e1d759854d8134f0524f242ab480bb54909cd65e58. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZFZ72091467.