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 0x16173a00d7637bda5c322e8459cc8a49fb76c871c32ded714af69b3142ecee3b. 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/e7ca2364-d59e-442e-b2a6-934e5953c74f.json and https://artists.proofprofile.net/proofs/artist/e7ca2364-d59e-442e-b2a6-934e5953c74f.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 0x7a941cd224684c5f0e9f2cc2236741e03dc9949714f2feccc87635b4e34775e2. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/HKC992524316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2895e9d8254dfd70abd38eac810a36416c291ea3367659028a4a9a6e4ef86f55. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG731676385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ce3c2e7f08315d7ebb98edcd3d1cf0451dfcc9b6c5a0997f31a054f87735c8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG731675822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f57da7ae64b194624498c0c51b5f9978185dd3d825b9227c2d02aab52cff9b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG731675823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fa8eb9bbcdae79f6db49ba859377e35efe67c638eee3fec95f55842c587547. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/HKG731603131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8fc1ace9990f3bc51117e0728e1910486e05e84f4bb03c2dd5f48d8bd01d63c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZZ972479262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa01e6fb419f9d8a8538822ccb8e28715becca4a804cc8444f7ad380f5564cb. Chain 2 (Bitcoin): anchored in block 957210 (2026-07-08T18:28:05Z), 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/HKG732281113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c56490bedf7c804de4530a33e9bb034096289a84611ee3610179dcfc3467c96. 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/QZXLZ2308640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47b9f3bb64e8b74ae1e2c9e8ceb00b4d40e931b795ddb2542a7671d2c8136ae. 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/HKG732228302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac0a00060aa08aafb571cc42984a578c16ff5480446f9c8a501c9a58412224d. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZXLZ2308649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546cd88c5dff9ced7b84894cfd34715d7f94a7b382cee54addd31cd3eefee533. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG731797910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ca4ce91b0fcbca093ec2e987a8413a0f5f83e664c394e3de692e2b4ed60c44. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKG731623568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f18d1b70692ac21e0a345bd6a96af6d4433409372123bb631b02d793d66501. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/HKG732141357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77934f1c796517f2fe2c59e1b02d9de7e5b0373cee8992a34027ca130caec0d. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/HKG732117957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5b59861e883c8f7a36e61d8f635b4f6f79f08bfba077a8eed74099bfa4121b. 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/HKG732140102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47b0e1e546c1bf202ef15e794aa421ad7f38b38ce284c32052c79e80e1a11e4. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/HKG732027554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5369596740846a4ec92408b05a717c49e5f89fc7746cb5dff72d439246e230c0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG732027556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebddf3e2072ae46a9cc16bccaadcb7da5aed3be59f3ef138df710d4fa2f9f5d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKG732027555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0888050d66b94f4386cba93240eb4c33c9842fea4b9f70c9df2c608239ee1d8d. 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/HKG731404779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a20aee1683e2bd096c1d6345200f6d92efac36ffe3430868ce3e5b556b5b557. 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/HKG732274401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9c7451a32f94b5fa6450f745a3231ae790fb22b145e0aa63ced5b6ae759270. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/HKG731616930.