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 0x813d4ff9360a77a3775d3e7a4fa5c944c88675ad35188bf8fb11eaa4b6fa29a7. 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/04ecf82c-2fb5-434a-a179-fefcebcad39e.json and https://artists.proofprofile.net/proofs/artist/04ecf82c-2fb5-434a-a179-fefcebcad39e.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 0xb445e40f613bb71a53c4dc47ebc8c30aa63e5fe100b3e062576da46c902f8eb4. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QZFZ42151657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8114c8056c45d87f0342c8cd13589a32a53352c193fa2b837cb58e9a239868. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZFZ62135289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ea7fa76d1f97621b4034be1015ef7ad03c734b26a0623d69bc7cbbdbc8b97d. 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/QZHN72283027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d53889fb3fd1267be027221ccfcb5b2304050d5b6381ea48a994c296eb5a048. 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/QZHN82292581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d64a43ae1cca1586f2fa57becf5ec174727cc31a89c1daeef86401be2d8d8e. 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/QZK6G2291149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aca19bf63db08989e84a299823b7a55669925470f299134b893b954ce41e795. 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/QZNWX2236667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0138147be49b9c9f8e5f5a7785d89ba14cb7762b9175ed6ca8c24af8b586d6cb. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZHN32343913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c526e1fda44218c8076af122cbec603942cf10d6161e7d8053e5175499b1e6d. 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/QZHN82375452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d766cbeae70c288b719ed01f5d26e9fe89ec4ed81a84526581b249c98bacf0f. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZS7J2396928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3d7c6f8a68dbda7e7bda3d1006e7ac0a57cca04422f41ad7a3d9f98ec29665. 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/QZS7J2477346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11355dc8cb52e3825e7934730ba1e6a9a37fd7c6d3c51f1e688cd99eaf3af3db. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZQAY2406194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd057a18d73bed9645178a9b49bb917b364402b44e8cb84ee54a13e59ef088bdf. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZQAY2405454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e6b90852da498cec249942acb6ab4faed8d170f5fb625fca6257e2b52f59c8. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZQAY2481468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7a8abcf2e70afc1263c2366c5e1773980365c5352989b537b8ea70c202ee5c. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZQAY2400809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ce736250874cd4763f0dcfbeb13f6187b71f7464961bea38083d66ee7008cd. 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/QZQAY2407811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048663aec5bc50bf7f0dcbf4b1dad7bff5c3558fb45286481b536b3689f7897a. 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/QZQAY2451229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf435393b2e401a89936e9f56b80bcfc2c02cc33b452b7753a7326196f8f1d9f4. 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/QMRSZ2500570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7795ee14be258a020f31241d1c9bf1c9b51474addc4215c00b4c39ff1550658b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMRSZ2500721.