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 0x225a6d3d8ffdc3e2b3136a36a9ed0e046258e913907ce84a07df29193253c0b2. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9444b04b-81dd-4131-b017-e6b051bd2a51.json and https://artists.proofprofile.net/proofs/artist/9444b04b-81dd-4131-b017-e6b051bd2a51.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 0xdaee4b3b805c903603938e80771ed348ff92a990c1e6c5db14874eaa3dda5f7c. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/NOHCN1503010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec107b110c5b529fccfd8b6f97ac8610f84e90a6e921c391114bae6d027df1a. 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/NOHVY2501001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff99b5e8e3424b206a5bf77bddbcf6bab994e2fe94c7f0237cf4dfeeaaa7d07a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NOHVY2501002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5259f2f303d37c77ddd4d3ca96a13ae4fca369b060f5349d0a694bfbd1892df. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NOHVY2501003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee9b15d499500f0fd6df44aa2e6251d009edc515c2bff0728e92bde03254bbe. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/NOHVY2501004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210b01c9b5b47eab1521fa72dfed06fde78d44fe4c678f1bdec74a4e35cf5fce. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NOHVY2501005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae62e3612e92d2995067b5e8cde81105ff026108c0824db9612d8e102b25bcac. 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/NOHVY2501006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ca26ce3f29cf848434a9d9d967b62b134405205bcf5f101f4e2c62ada4ac71. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NOHVY2501007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1f0304fdcfc1e2434fdff2a214d39851e0a787c223c785d7ba70c158df1bb0. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/NOHVY2501008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf2b6d315a77e62873c378060842be64443bb26e9c5e8bf188402a0e7c12948. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NOHVY2501009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0f60ec6b314b297b10acf8455edb64dd71fe71fa0dc099b7f99a7c15ca2554. 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/NOHVY2501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13edf1aa24d93d77acd318dd8ba0eda3c4f1a97bcc82fa43c14d468e776bf421. 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/NOHVY2501011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc9e315ff3c5e810121ed5ddc20b05649a7226d6a3dce8f044d1fa77b94ff94. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NOHVY2501012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df539202ae4d84b067b184fb6e40f49306293538df94d239ee326fc3bddbd40. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NOHVY2501013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40b14b42d68396d1ff38893a29fb0ca4c02a013be5f6796cbd607b08171da0e. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/NOHVY2501014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f3276cf843def24f475096a89dad50dccbb2b1dd294781ce58d2af34596c61. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/NOHVY2501016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d102ae19f2dc7732bef13b810122c4af08fb242305115b99a0248b513f963f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NOHVY2501018.