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 0x02487e0d9f79568ee0c5e6afb9b5b835658d8f923b2abe935f88b10da92a5d27. 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/e4f5f1e2-941f-4181-b146-63a53fa1b74e.json and https://artists.proofprofile.net/proofs/artist/e4f5f1e2-941f-4181-b146-63a53fa1b74e.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 0x9d1c8e3687ecb1d1744719100a92594f47d54758b1d7aaf1484c3a5f1df7ffba. 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/USWR50328037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98f1b8ff19ea2563e8e39eb157e74ea2cdef5f37514c4dcbf4bb40270d17dc1. 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/USWR50728529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e6c8eeb078c19e3d9031b68d0cce856fe8194103caa8e253cb5a4ed8ea0626. 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/USCGJ0968170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2196c8d8eae7fd1a452905b17c29ce99a327ec5cc2d87f85de085f05be63f2. 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/USCGJ0968171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15f2417ca1103986f0613b344c3d6b2d6ec846c9099aff026e688ffa72e1b08. 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/USCGJ0968172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e752dee876a0d02e49d42c9a3448db1af8766ad1e8499994905209a534da104. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QMUDT1200047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d47f9a420d84dc76560c4de9af1ec59c363fb3718744b7af16c21b629fa5f63. 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/QMUDT1200054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b3244bb0e2a9df09dff709b0e64bef01af359ad0efb1785a85a06c73748859. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QMUDT1200092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880e6c17e9050093529f8933921739fecfee81ac15f1a21b207f7bb168d43445. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMUDT1200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcfae53084e4b840851d341536a5adf9ac7a1863e1ddcf0af858076a57d6b7d2. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QMUDT1200094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cad14a7f25a4a2c69dcefb6af13cd30f229c33a8c19b58fb98099f782887a87. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QMUDT1200095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d125d80f0bdfe63626d7948c96fc666e7ea22d780bce44481a5aa47724010ab. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QMUDT1200096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac031bf5c564dfb930e299030e55607511289ad32a8f28c9c74bfddc80517e1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QMUDT1200097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc0245bf97032ac103b5f9e5c4ed659f3baef779ead97f997900e32848b9984. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QMUDT1200098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0973b52e60abe3e2d64723811dd762e8fae2d5e53408600c22f07e8fe87e2b7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMUDT1200099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b1b11daf078345c721a0cfa6cdc4338382dcb4d41c6d78b5ed7ead97385fb4. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QMUDT1200100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc66190b51f99b1a1cef4d4cca0c8a4968450d71c9d08a1c407f8d2cd18f6910. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QMUDT1200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d9b9597f8addab58e836c37f99644d2f15bd9d18256ca0ef30e77f079058d7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMUDT1200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe27bd7cf6f16572aac8804995aa413d6bfe52eb1d5b34110a766f6ed7f306fd. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/US6YC2500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd589036da575ec13df64e25b36a1fea45b6b5aa8307b776a57bca8a6166291b0. 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/QMEU32501606.