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 0xfed9c1e588f2bedabc66bc552d2be4d44bd39b50f19dd70833eef20d3184a093. 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/332f337d-f4b5-4973-8c20-8a219262bbf4.json and https://artists.proofprofile.net/proofs/artist/332f337d-f4b5-4973-8c20-8a219262bbf4.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 0xa1a98d90aada52927f911fd00f27d373508d1e63e0595fce7e1888a00bc69ced. 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/NLCK41053403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8dc0e70fcdb5f0a0fc3402ae1ecfda90ec9ac41007a739737c59103384ac06c. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/GBKQU1911052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943dbe17d23b14aa9031a81d520cd9691eefd03f35ad12118a0fe290b3ae9f91. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBKQU1964931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9947be7597e4e172b018290ebd0e8e45c6514150b547bc9f088e04ab8e78a822. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBKQU1983834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7353dcde4ffdcf23220acf6a389c65eff74b73e9f315022b342bbf2cad0a7c6e. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/UK6GD2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262e1a9b93b0b72fbb1c780081969c35f4e5bbde125957b72a578c979379515d. 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/GBJX32163401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde72b8162e29a622658a38cbc065a3c5a21bd551341a84043f7f2a5da242cc4. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/GBKQU2184193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d70b230b82efd11e5390e4c726d617b310be62a066ce63586f50b3a27fb86d. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/GBJX32163403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeaed78de4c1a198d3e830dd82005499dca53a08ea20971b9ffe097480de99a7. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/ITA061302196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1230c18961bb530092166c637c515b85a592ac9af8216337af4e20eb32d32fc2. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/TCAGQ2208292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b0d6c7b99d09287af185ad347b06b226da4c42c43dd1e3564c85a5e446e41d. 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/ITA061302403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f10d69d533a1f2a5f7874d25b812f4ca92b6e40c913a65f03b9ff45d8747504. 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/GBLV62308086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed29241725d0bc0aa94c3bf08cf67136e862dccacf81fda3bd359e3cec7a56a3. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GBKQU2417967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411b9ad7b1f6a304981d329df5037c8252a5cdeb22065fc79e797078dfd2238d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GBKQU2457572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b6d5a951a29813c80c1b83ec983617b346716f63859e1ec06fe2ea3b70fe1f. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/GBKQU2457573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e010812fb09d50d491a7662731bfde1343f2a57c130c384436df6640c151468. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/GBKQU2504304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d5fd37eeb0f87bd4ede13626fa8525e841c3f425a601b79e1fabe8f8f079b9. 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/GBKQU2504305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f45234fd5c4b669f9e7f29d6ccc52ecd61e98b4304bd7f52a82e789d672df1b. 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/GBKQU2504306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d320b8190b9f3148e48fd6a6e6fdf9814ad0edd03a20d814ce5b25c6d574c9. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/GBKQU2514544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe88216e107145005a7b7b3fcb25034640caec5a1d0503c58554493797c92133. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLCK41045957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec0ab3f7d799bcfd1c397aa92777dcc0d8579c14ffa4c8f89d9369748a6e269. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBKQU2487564.