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 0x7c4d1c7a81133c58f043ddb0a8da71b65f8856d810c44ea9ae4fd2d3eda44f70. 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/7c70fa22-663e-44f4-98c2-cb77eb585b91.json and https://artists.proofprofile.net/proofs/artist/7c70fa22-663e-44f4-98c2-cb77eb585b91.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 0xc151db549f08904ec37de372707fc45e48b835db662d67e37655a503cf1da5f5. 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/BRUM72400622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacd7c5691a23d2e8dd8255f9456b0260f150ac644809f140f72ad35cf086b3b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/BRUM72401249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f1dd34dcf279ce9073722854df3197692b0332cb92081054e2f05974892903. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/BRUM72402913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ef2bc46479a4f000d9e601e4cb1628df34ab48a7f28b0d0121d6a09e1306ca. 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/BRUM72402115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacd7c5691a23d2e8dd8255f9456b0260f150ac644809f140f72ad35cf086b3b. 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/BRUM72401249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02294e7821599cdef540b822e61d4b0f8c9452a3eec460221b0c570eaae4f1e. 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/BRUM72402357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9e812bd14aff82ede6f06957218c1f13a22aeccd807670b7e826314473de20. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:10:39Z), 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/BRUM72402118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36927a803ed5e24c5b9fb5c9246d1b4b234d1dbc4d37afee8f3f7226231548c9. 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/BRUM72402119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc444dcdaba567a1349a3b5beffe0b6e50e5918d380ad8144cab92c97d065c606. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T23:14:45Z), 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/BRUM72402121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd319ef5b2db9015467079c902298c30836bb96737df59ec7b13c320a1a4cf299. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/BRUM72402123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f73bb2e9fde7089ec80e91df5fbc90c486bd8732fb142a60d844c8199746932. 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/BRUM72402124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fa9c7b5eb6896460626b57f83c86ab07cc5cf7a44ba3a01ac9288296eca62d. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BXG6R2401038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5389f99b8a3ba370a5a578531b3b2a96e5651ba5b4579b3f769fdeca8015e6aa. 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/BX6Y62400090.