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 0x74551ae2a7aa20eb070ea398ac753288f9dc0450bad7139142f4d4fd8bef1bf4. 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/e5baf82b-0c23-4a30-a97f-f61b6abdab7e.json and https://artists.proofprofile.net/proofs/artist/e5baf82b-0c23-4a30-a97f-f61b6abdab7e.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 0x3546e2ab0c9b747dc0019af20ec6b0b7d413b70b58c4a74e9b1828f727804b42. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZHN62201281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13863a51d2c09d5d1745bdc9b2efd48ef8fa22ca3dea585d165d18ef39a2852. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZHN62201283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0caa5d5274931be47e3772944fc7f91557a482e548d513c5ad41611c9824f1d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZHN62201285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82dda53dc3bf29973efecd7c5a5f29eb36803e9a9d160a963366ba32f2bca02. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZHN62201287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d072e99f7b054c57aa477392efe927b56efd49c2bab37982ca538a63082641. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZHN62201288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9fe1d40f45df41604b75a95b927e06638ec3f7924f4bec645dd9ccb517b3bf. 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/QZHN62201289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26580ff392917b823afe3f86ae9024ea2f4c955055dbbf0323cca3961935bf15. 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/QZHN62201290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5447c00285eeaea963611d1466d3b405cb1325e61f0e47597aa9c5d7ac4527. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZHN62201291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab745a4d4f7f2291f4f333f0d6a42d744325cab887c543da468725753ff5e792. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZHN62201292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4353e6da255dfe01d33742af41fe860822abb7d09b5310370e1ebfef0371f34e. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZHNC2296134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4d2a41f436a2f167720b5acf3acc78ff5eebb2e119e5514ef897cc36351a3a. 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/QZHNC2296136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf12a91ac994cba6668fa53cff52cf5b413a2deb5ea6b528013a3386ff4a4d7b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US2642353705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ffac9531d0b2d0d244586939e1eed4efa9581de50655e58d5db680c8a6de33. 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/US2642353706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57420d3ec6b5ac37177030037d1a91e87009e38cea0768d8c8dadf3325e3e05. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/US2642353708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbbc0ee07db89d3cfa6d06e4e484f7d5a108d02f30fe64aa2d4d499d3dde7b55. 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/US2642353709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d616e23d5dd4744a5e0efd9a7358cad58f7edb3b972846f5d79a318e5eba35. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/US2642353710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7423559232fb630c37e20cc204ef7e0a4326f22d8b88a8467c403ebcc46864. 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/US2642353711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9990e09c1f1a38406deca15d3ed851e7be67c3cbb825a9bf749911ce1316fa46. 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/US2642457202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629633a7e1c5d50e456090bc193d251591fbfa8b08d6727c985f590ec57f3143. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US2642457205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb888459d0577f5d36d62bba77815276c13f3c9511908f0db23c5bcfa74f9dac9. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/US2642457201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbf4bb8923848887b4d2dce3221c5817c1b0abdd39fa0b0896d143a9aa2178d. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/US2642457204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1917bad0179ef92a90d7a60a7ab114e702e6c858a082fd8de18126c0540e839c. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/US2642457206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68688090b3fe3e7d33dcb9ac64eaecca32da28ad6f0c26df587492d6cc9c845. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/US2642457207.