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 0x062cf6eb8d2c71335cef7570b099d87fc95ab860dc04e12d293b250671c55a96. 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/71bfcef5-1b74-41d2-9bd4-be945b6178af.json and https://artists.proofprofile.net/proofs/artist/71bfcef5-1b74-41d2-9bd4-be945b6178af.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 0x013736c628d336a54514d84e0bcc1f11b185f5b092eb4c1defc35068b6bc3993. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/UKF341700044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b6692182e740557fd3966f089a05250ff896aee11898fbdbf0379598161e39. 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/UKJXX1800030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdcee104a654aa5b520577904cf0f3f7205330def9b009a25650a91fcfed457d. 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/FR2X42263928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d25d6e3295ca3564e00b2fb0c31e0edb02d579e3e64bf46dca8b32b53a91f75. 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/GXF9Q2597215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b15ce4f75c59bad18351fe60eaee58f7f583570d117f2da1769609b863bc424. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/GXF9Q2597217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40757bb41830f8aa965fd6822d854ccdbca95f0bff86cdfc44636c05f58e9c1. 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/GXF9Q2597225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9370eaf2c7790007a25b648039226fae3c6cda91f35c9cc28ff1dbfbabb973. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6Q1922934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f23c5c02ae2199c26c3cf1c20d13be2c5c3632b14b60d7314f7dcc9b425eee5. 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/PTEN11700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b2c579e665e7b9a4e5659935b4022fd10c1a0acf503f0ac285742226537fcc. 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/GBKPL1937557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31273e47cd2ef4feaa882aec911e2b175163a2fdd2ea9255141c85d8acc60a2b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKPL1938548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f23c5c02ae2199c26c3cf1c20d13be2c5c3632b14b60d7314f7dcc9b425eee5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PTEN11700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ee309692f3f7139232d2ab3a93d67c10bd3a79038d1f7698d8485937133078. 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/QMBZ92292257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75ff2f6311b79c1df5cb2ead483646ad98c4326c7b8966235b5ba765d61218a. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/FRX452136540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb002883fad646a60f9f7580bc1fe8f662429b38ea6271e866d28fc57184797. 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/GBKQU2468457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325f2d17571f1907f8810869cf2a691b547e61724a2c5950908faa6d5b5531da. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBKQU2468453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb002883fad646a60f9f7580bc1fe8f662429b38ea6271e866d28fc57184797. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/GBKQU2468457.