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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 0xb5ebf1318fcdf45ffd2d6fb460bd0fae0d3614f167c372a743b17020b73fee53. 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/014ec2f0-37c2-4443-a1c7-022b08f0b1bf.json and https://artists.proofprofile.net/proofs/artist/014ec2f0-37c2-4443-a1c7-022b08f0b1bf.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 0x8851c3399ca92fbf7b1200519cd9476cd97b6883579c58b6cdf9de77dcff62c1. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/USY251993751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310ef3dcfe5d60edb4c231063b437821cf459da0238883d6b8188fceb5c038a5. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USY251993752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0628c07bb72c5f7bfef2b02b70b144abdf7beaaf24485f392c3a2ed50dd978a. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USY251993757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f51be551cf16cd1a0a3aab9c64282c3d0d15eab577c5761dae1e7ee832d6d6. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/US4B20600369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a0e907aac5f0848d657574f0a384c5162dbb5016bdbea1663051de1cc5e321. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/US4B20600370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3644dcd88c5212794beaf5c0f0060be45b307ba02260730aab11b027b0daf4ae. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/US4B20600372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc6421967c59ed5d37e87796e4fc6d26074f9fc2793fb5105bed5ebda86e89e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/US4B20600373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17304d0a3fe27c5f301ec39ee40885fd09a7ce08155d555dff3e1374e5b7072. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/US4B20600374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff1f73bf7c911df3ad85a50899661e44dcce3cd26fa129e51871dde7fe98a1a. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/US4B20600376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900dfb2d555ed1428e3ff041cbc3ff64b2f4c641a0d3ad2f792eb58d9565a408. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/US4B20600377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c35cdbc53bf3d9f9c42f61688b90384b34d0dc9dbea7fc380e1528c40e21e1. 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/USY251991830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2631e249a87e77b3008eb5b524cb23ccb782b65b05ff108c6d35de810d9d650. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USY251991831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a019e6919abdccd8eb373e4de5276565b39967bbbce7a81d782378dc7cc7e3. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/USY251991832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a019e6919abdccd8eb373e4de5276565b39967bbbce7a81d782378dc7cc7e3. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USY251991832.