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 0xc6fb253efd7c8382aa425c15c19bb25cc0cc5d22d8d83b21ef14a324eac1cab6. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09130e60-46e8-4789-9ae0-d645369b6f9f.json and https://artists.proofprofile.net/proofs/artist/09130e60-46e8-4789-9ae0-d645369b6f9f.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 0xe8549bd3c168880ece141ac58c20b87fd89ab660dac036fa31110f22feb0dc4a. 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/NLXN61300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa7d82db4428a5eba7839625a05a90c99068cc915adc283d7acbb0d8ab631cf. 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/NLXN61300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7dd0606523b020e4c22dcaa0d53d9db9a191414cc1a671a229f4260d288edf. 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/NLXN61400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d5312987de1b6328e469c770d722e3b14bb37a3fe926866b3abc7a1cb88ee7. 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/NLXN61300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cd03d9be25779161d479088ff3b3473eb3389606a7bd93d1691346a63f87b9. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLXN62300053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ec91c7426d52f3983c9b5e6352bdcf9c0cc84b6d3d3386a150cd41f2976f68. 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/NLXN62300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880c3c0a6e551b3a3df7552cb6fe67e1b38bf805f1e1f6e25b9ed04c650b973c. 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/NLXN62200047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa120ef9831805384b16a178c57807d01a705dc52c4ded2e3d3905d28eb027c2. 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/NLXN62200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c09c6d94334985c097771ec0064b6fef0267b024d956e9683d689b85b17a25c. 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/NLXN62100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee307de22fdd70427b287d6e940b941da59a1e1d5dc50d6f0a1902372f6f07a9. 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/NLXN62000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae488f7dcf028000cf2b1f69d973890963c595b47fe7ab15653142ebb3133712. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NLXN62000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e7d873408bbed6df907ef0b3df3c4fbbdab314520755d69794be51bf2b3d51. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLG6P1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5e95f0907acabe196d4d3da241d660129a2383c2ff420a899b0f0b1bd7829b. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/NLG6P1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e4292d2d81eca155aad89f7d6fc7c3a3ea58a1c2a05f61e04fdccc873ecf72. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/NLG6P1800016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e5640955cb9722fb0746d1342d730ec3da3e8df3d4dad79af01e0b291fd299. 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/NLG6P1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ffdb12376eda4f4c42b6a398008c70fe21e65803b651ec5109901b2bcd1035. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLXN61700089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23946d49e4a0384046feab8d733fe49864c6bb146706c3f3a739ee5147780c54. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLXN61600037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210b6791908aa8c4b5ec04ba405c63f718532ce7918ac6dd56fb00551f76e25c. 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/NLXN61500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cad84847bd1a2714147dc2a44f31dd2d79c4fb7c5fec469ee63e28e98fd3c48. 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/NLXN61400019.