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 0xb8fddff99f9d58228eb29da967792d76524d657a1ae529411e735341b655692e. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1cf527d-60b2-41fd-8fdf-14892ca42e22.json and https://artists.proofprofile.net/proofs/artist/f1cf527d-60b2-41fd-8fdf-14892ca42e22.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 0x0f2424500b4af8809c717a12fd1386117e244d9b48bff4bef464ffd8867ce886. 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/QZFZ42206202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e98f6a886e5769de482d3f3d09b4410aafa7f59e95e03bd77329addb84995e. 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/QZFZ42206203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45744b5ff807fee8b4c54a435e732d13e0ecd875474da629b794732bd499930. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZFZ42206204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5730a07b9ae1cdf71cca5a9617112114f91f05d9bc3faea8c3bcb7e183a7783f. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZFZ42206205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d36b96302188a3922f559e139e81ceae4c9534534947d4eedcf568df5f024d. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZFZ42206206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689be92ac8c0b16cce688eeeefe599e90caa420fcc7ecafa498b374085e6d50e. 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/QZK6K2428511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2da6374224cda9f3ccbed5c809210abae7623c16794cadd285cc3e7a26f8668. 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/QZK6K2428512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad9ad29fbab7c2d786424dc00e75ba133bec6098212ecfe5c96591508313603. 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/QZK6K2428513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97305e1849a8be5b863d4ea290875aba855310e7298238083706ea13e4f37ca4. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZK6K2428514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703f047a29c66d528c40c6f64af91ff39d14cf5890f444a648a14e1765278f06. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZK6K2428515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0d916892b8263e56082f5fc0917d0fcc63b58e196a12e125564148eecfba54. 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/QZK6K2428516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f253888bd09e4a6bcad42a69f30d005524b11c21c04a42c2acd5dc9f2185d9. 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/QZK6K2431899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6937269547d8702393dae1b3660733b146ab8feaa31b95da737fd3b427881bf6. 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/QZK6K2431900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd152ee0f8849c155703cc8769c1c18cbfbe9597384b3892fed9f8fc56f1b52. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QZK6K2431901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f0a1f286e3944c67e438a98788e2805bf146b12cb889f412cedd90e5956c5c. 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/QZK6K2431902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f5cf8ffbc109e3a608d3740e7ec9e039413fb32be7a9f3693de9b5e6bba99e. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZK6K2431903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a3d84a520c125c93358b8a77a8a7350ee96509c64311d955424d9f995f3996. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6K2431904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688ca7a5298e0ef986d9c8f642be3b4546b130ef5287c4291e750bcdefae9cf5. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZK6K2431863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98b92a5b68e292bed67fe1e38fb11c7a6f17a1b7d79bcb07d15201aba4b78b4. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZK6K2431864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb07c4c70b0eccc7f4af704941add118d4bcc926c3f0e6ecd2aa9b00551e21ef. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZK6K2431865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2a1503b77fb80b860cbfb54045aa4747d05475160d10786fd3c7b4763db357. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZK6K2431866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67f4ff5eb8778217d30857a00d115ef06234a87dd02c9f6369f47e02c014839. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZK6K2431867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c4d76580c77a590b6b10cfb84105d41fc114c3fcf848294c7df2f5e33a9d9d. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZK6K2431868.