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 0x6dd6ceebec05b90c443fdd5f95c7f1a3b98b9da468f3897e98cfc5a567025705. 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/92185708-e65e-4eed-adbf-9328f6700444.json and https://artists.proofprofile.net/proofs/artist/92185708-e65e-4eed-adbf-9328f6700444.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 0x1f93adb43e19f0fe2b024bd9331006982c9118a0beefa66a421bfd1381622bbb. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/ES71G2044682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5efc290e3a6f7149f366a00e584d6a2d7acd30eb9ae743dd36200b1ae42b36. 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/ES71G2132358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58edc7ec3403dcba74a34e9fffa24a4da96be20019baba84eae34b4977262472. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/ES71G2145156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76744212d5ae71f9eb89c759b3a01a82516b0e85ab271a8a0a6035c4eac8214f. 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/ES71G2147080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ce653ab8b6015fac95d4dcef51cb04d0140f57cf8e8f405658bd5811f5323b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ES71G2315308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c34dae361e5b787af08e1625a2806c38b4a76c2ff0dc444f611450b5fc9b46. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES71G2325804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24eeb9d5bc6157e420a5b5c4b3ca79aa58e9123d7b523b63d4d14275c7af87d. 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/QZFYY2443038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5327e34c4fc90f367d57e7086586fd41b25f971c2791cde723641d10c576d6. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/QZFYY2489329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055b6740e49fa6241095d07b2d549b3f5b4ff858a1c8429ab9dfd36e6090a872. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZK6P2489894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c32505a52a46a288c76cf5de65a497101aa8ab80a51d0cd8e11cfb0ca2a7fd6. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZNWT2439964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1315c8227a98495a1ae15afae31858118c0eeff67a352b66ab5850ff8392ed1. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFG2406567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea208ba44fbd4b8d61bf46f3476124b3839755132b4015737f4638110917f3c. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZWFP2454594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba61ad634faa82bd7554cde228a5dd8fdc816cf457574db98f980e1321f20ed. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZFZ32534053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1442c8c360c97089d1610ca5901548eba6b8a88f5a85a8ced8e7a1f048b24bab. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZFZ32572945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570143752236ddf661a7ecc36aaaa7edc83c7ed9958a55263c30d3de7a674e68. 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/QZDA42591392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2dcd8deeafa983ef9263887c6f0196225f4bbea0bbe0f4434e4b9a33630546. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZHN92591135.