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 0xb44bcb416a6dd8ec7b6b588b833cf4859b5015391b20915766be999bddd6ea00. 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/e78450c7-8dc4-4aa7-902b-0d0d3bc9de45.json and https://artists.proofprofile.net/proofs/artist/e78450c7-8dc4-4aa7-902b-0d0d3bc9de45.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 0x189b6acb560aa31b75cad7faa39b8753b4872734871f60eba6c0bf4bedee402f. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/USHM22142355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b10d00ce4c68f589c1429ab099c78dba07f70a2c242a69a6a008444f4718f0. 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/USCGH2254397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb288eadf4aeae2fc569a5c03031e431dcc5106e0a1b8fa2065c7be0e7ea4453d. 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/USL4Q2135004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9177262f34a364cadc9e578636f607e8b5fdf61262c87014f63c4d55e93b33. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USL4R2142833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf314545f34c7faa561340837265ba56145b5d50a5ec537c9a3d3821d3f08bc4. 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/QZHNA2249710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8c20df771d885d9dbb7250ed3f6cf6109208890e7cf67101f442fa7e6a5fa2. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:34:10Z), 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/QZNWZ2290732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3516bd69266bf44e81d6dd28848c65f0f1bc684164104ab6723a705320df8b8. Chain 2 (Bitcoin): anchored in block 957676 (2026-07-12T08:20:25Z), 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/QZNWZ2290733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b6ec8dd0d87b293116adb6bc2304fff0b28f14cae1134424099105d132eea5. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T09:57:53Z), 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/QZTAY2298807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b0272492538eed7bde00659d47748199a97c93173eae9d660d277c0dc52fa2. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZTAY2239954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b652102048723b4d0820d4bda9963124c21ee11af0769b77110ad8dce62a31c. 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/QZTAY2299516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a86c5989291e99d20c380e7f00c6e0ae9a0b9542e6581909a352336cc4e4028. 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/QZTB52276952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea72b7b6b0a86e31f429ef6370134196eb1af65db4646d4385b2e188561343f. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZTB62215592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4caf23db3975bdb311868245d245ac33b0ae32f0ba50c148e447389870618702. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZTAY2298828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b6ec8dd0d87b293116adb6bc2304fff0b28f14cae1134424099105d132eea5. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZTAY2298807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea72b7b6b0a86e31f429ef6370134196eb1af65db4646d4385b2e188561343f. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZTB62215592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a79f61dec56f9f7f9f2b272f151b18343acdfe3b52061d74792275e3bf30f47. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T00:11:17Z), 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/QZTB52276965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a86c5989291e99d20c380e7f00c6e0ae9a0b9542e6581909a352336cc4e4028. 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/QZTB52276952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b652102048723b4d0820d4bda9963124c21ee11af0769b77110ad8dce62a31c. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTAY2299516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b0272492538eed7bde00659d47748199a97c93173eae9d660d277c0dc52fa2. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZTAY2239954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8206a6ccb79688a42677bb8bd6157af1f006fff3b2618e8cf23f766d855d1d. 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/QZHNA2468790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62dd92696bab476610f742bd430f2a05dd798bb6743857390d90e9f46f7992e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZZ7X2561044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd401f8ba0004d0f0825cb5e8b6824c9a5053c970232156969757d9e6ee4f3923. 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/QT3EZ2582574.