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 0xb2a8e192ad741d966bb65ccaef5684dbead7f33bc38f00c1f498ceef7acca409. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e86ede51-e98b-4dac-a268-cdd444802150.json and https://artists.proofprofile.net/proofs/artist/e86ede51-e98b-4dac-a268-cdd444802150.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 0xeaddd6df1fe6470692d57c79414c16d3764d8ac3d1c9c9c2ca83e5756087d0dc. 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/GBLFP2551625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2920556b34c1e267d81fc43660f57ddaf5c28b5e21bede10115723733e1bf04a. 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/GBLFP2553026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7575999168e7b48e82d0dc563e674c9cba1a21a7470bbf8294951ffe23a953. 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/GBLFP2553000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae4b39aa8a5f0bc672dd1c460f7e51bdfe068a1d6cbee6612b0ba5c72ef3e43. 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/GBLFP2553024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fbd09beb4c42f51afbeddbb874264c6afed9a9aa41a98f382f3b4c35964582. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GBLFP2587874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf85d9a53cfb5acad1dbd6faa049aaf4a9430d2848aca8e71f4e56f9434e05a. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/GBLFP2587862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5edb9d3c5c7c4c655b250110d4328f61690bdd7dd26de40d391d3bdc93a71157. 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/GBLFP2587513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ff7d33d494c7ab01ea5c9f09a5e0c82c6a12e6a05f15bfe36289d3b9102e52. 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/GBLFP2591546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf5c493a774a1182ccf3120ca66beb5a8a165e02e56de391b169c2067957856. Chain 2 (Bitcoin): anchored in block 957791 (2026-07-13T02:46:19Z), 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/GXHG92560225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3611bd248497517a7165c3da1c05a3b0f1c146b0651b2d1db09ae27dc3e5284. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/GXHG92560358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65fbe4cb5147b2165c72b79163de3af13cd382cea0c9a41e8f196ef822d4616. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/GXHG92560360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855a607bd602dbb4b6a7c61b9a2610c40eacf49f5b4da9f5c05690e9d5f6a0a5. 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/GXHG92560224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836b8c2f247581d4ce7cfc5b5ff326ce73358ec0d836bf6ce28e5d2e407ff4a0. 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/GXHND2518865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a16f2da857b84be11781b09111fb9c2624dfc9be20f369f84168fdc5fb8da07. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/GXHUT2525387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c915e6644b005a79f8b599ff2f258c9e4d331db1495729a939957854eb363a. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/GXHUT2525222.