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 0x7ea170ab95952a51620177c52f132b8b71ef0e97c6a180fcff58ab827a13588a. 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/78441cc9-c199-496f-906d-29d6fb64b54b.json and https://artists.proofprofile.net/proofs/artist/78441cc9-c199-496f-906d-29d6fb64b54b.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 0xbe87736001ba67050b3ca8feb9821425fcb8d76b1c7df72740ca3ceaa347b2ac. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAEA1815223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29cfdbf312fa87b6a9d2c33ad3deec649991093f98438717ec02c9a4ab3f9a5a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCADS1865137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c2fb2ec8e04349c4f653777bb1f7682eda1d990a68b6cd919b14971836f497. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAEX2046219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3214dddcf37f013138f6aa341cb508ac6632b1584457e9d8130a0b5f1aa9f9. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QMRTJ2201230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ba41392237fb27e4975ac038b96185f4ad5ac9c8f6276539dccddca9b2987d. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:28:58Z), 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/QZW9M2291747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7943d47b3e30502e7e9bf31b728e870791be42667497f58555f9dfe07f4ee855. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/QMRTJ2300846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18cb0d4ae98c78b5a3336774f99ee8cee240ded40644f4a4f8788d73b7e9ab1. 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/QMRTJ2300891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e783b2bd0afd9476a7b48f6863ac3c1b6845261c9fbf63eb90c2e5af0ad1ab. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTB92368200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9390588a6e1d2b7bef78e39a92c5a5e9d28683b98adc06d419aee647518f7f71. 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/QZNWS2414190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69830ccffb626cda238034429b054c7502965ce2176bf5ac20336ce23f60d4eb. 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/QZTBC2403707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfbd8ede0149db5819bc4660b0a0d0f0e4fceb00734a24766722735eb9b9296. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QMRTJ2401211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12221a35262ee81489f78fcec03d5301a611ba44265c38f4fda93afe62ed98b0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7Q2445357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526b72054e0f0de0c2361d4d967aab5ae60a1d34ebb62f2c9cb4b11f3499252d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZZEC2460448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698061d45998440f3d1e2cd20f4b1177d27a35968933187fdb620626c3c2c94c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZW9L2310281.