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 0xf3b652a1527e6fadaf42098906bacc2e5df3c6b4b59d4036763fa7fd6a1c4f30. 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/bfad6e01-4baa-4825-aad7-5ffb7841fb2c.json and https://artists.proofprofile.net/proofs/artist/bfad6e01-4baa-4825-aad7-5ffb7841fb2c.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 0xe279031c2cc9c78d84249b5379ef7407508335cfbdd16f25dc09a520caf4ddaa. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USHM80720525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0adbd9f801b768005c4473a342b5d07521a365bc377f098a1c6c982f8719e4. 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/USHM80720527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec649e4165b5e29c927ce504dc59d47becab6dbd8eadc49889579273c4284e7f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USHM80720530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada22d853b118f428c717a04db634fd45622979c5dc922975bcef9a9e4c00cf3. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USHM80720533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d61442a7a7eadcc18b68d2f9def39ebba7dcfd87da8f2d7e59de891ce785b9. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USHM80720538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf050443808da3a233e3f471d2eff024323cc38cc91405be09a00d594eb652b53. 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/USDHM1501270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c7b74e8036568fb1e5a28fad7537cc6e9916539ff147138f85d07dfa72be69. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USDHM1501271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410a028d9cc3397566ebb652f869012a08043a776cd65dac2162f67208b1a32e. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/USDHM1501273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11206b90dc8b8b44d0d7869c53fa07f07a14da080cd5b1a5af9d16eeda9b131d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USDHM1501274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68860fcf7b7efa8a637fbe92b0d49a49dd71ad000609b1548ad8e044d18f6a42. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/USDHM1501275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5fa0121c59cf17cdb6aafb83514d1f1835f36fac6159fc03afda05498310e3. 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/USDHM1501276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee9683cec8762fea02a7bdcbff9606a11f13e206a9256cee9d00196820b4d74. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USDHM1501277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e554dc35068dd57553adcfc0119ba3768dc51598ac39cb11ce3b2296492c52. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZK6F2224407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188297a601a229337fd1c261f68e880461d0a7eb276c894ad3a14eabf7a7d06a. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/USA2P2319740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf6e1d5d36ffc17f5cabcff844b181718fee2970207d985d86b054145696015. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USA2P2430948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44cc9861e14fe6e806a140bb289c698602426f2558d910f334a19f3bba82e09c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USA2P2430951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559bdb63748932b450f127ebed71465bd02a3c2d8b01320c4ef60b0d20168721. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/USA2P2430952.