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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e4649932c911665afa2f6e4e68bfd071cd18b4380782e0d87ad1fc1c2b6edc. 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/372a2757-1f91-4bbe-a39a-c79a14af7f20.json and https://artists.proofprofile.net/proofs/artist/372a2757-1f91-4bbe-a39a-c79a14af7f20.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9ac76e9b8827d58998384c12abbe63eb26fe1999b800a622dda8ba5e86e6eb. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T15:40:59Z), 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/QZMEP2179331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9057ef14cb14d231736462982dfda796e9e2510db4ad7ddef0709f2649cb22a. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:11:45Z), 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/QZNWU2100722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0884183b31e8bef074bd065f94721b27a2e0b201d83d7b702eab0ad71467a5ce. 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/QZHN72275563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88272421296713ef4f7f8a51e7557b0a6cb74185d84077a0b38e05e2d674b61. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZFZ72336251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897614f1d88f7ee0e7db0dce17e28f697f45e879c277fa4801431f7473aeb8d9. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:39:20Z), 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/QZES62373317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413406c04ed647af5ac7bcaa800616c9ffb6a649c6fd2cacdaeddb49da1c44a9. 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/QZK6Q2345037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14d542cb640e696e8472ff2e2038e4eb9c175f70300868fa208bfcd4afe61da. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:57:27Z), 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/QZK6Q2345038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1738918b8be3e3c2186d46c979b1326dac1fa2e25f79fb726e3835f665d58518. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6Q2345039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f0ca499db49177d55416e753891cf10fde9cd50652d7381e95f319cc7becfc. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZK6Q2345040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c9fa11c6212e7fef13d6bc8789e94c4aaa95c106569ce8edd77baeba252201. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZHN62561219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7848ad44295efcfc2ee4671ad8b4bfb5ca96f6b687e514155eda0671f14fa51. 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/QZK6H2315293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f11c0504b262afdc9583cc1678acdc97e7cf54d2e7a4eb561867e9beb36dfd. 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/QZNWV2288462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c9da7176b64bb30a50cafb975c8d01ebb39383e9a69783b897fd23a6379f51. 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/QZDA52512957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d360e4e87dab39f7d510e166e54b36893935a91c4083a8c6e05b7b86f15d32. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB72242502.
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 0xd3fd345a18a3557ffa87e5faa91501a5ad453e33f6b069131e7951585117f916. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZHNB2142581.