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 0x3701bb3d1229e13f9b4aae366e20b1af07fe95f64ab3e632c69d8668c37d88b0. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/573a50ae-d743-4b5c-a394-8189162047a7.json and https://artists.proofprofile.net/proofs/artist/573a50ae-d743-4b5c-a394-8189162047a7.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 0x468d27237161540b9b23fef23e24fdf1daf3b39ea52550ef6741995d0eba83b7. 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/TCAJB2405098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500e0e5556e13422a16e41325ab31b90a36715aaa3105cadfecbdea752697c4d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TCAJA2410385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62a088476d352dc8712008eab8c6958da7418e5ee6cb2cf804f1d9369663eed. 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/TCAJA2410400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0d62aa0b127dfd85bed724abae909de3522efcc90d4c8af0362acabcfd249a. 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/TCAJA2410407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d144c8f024832b8ac72b441170267c0eb707dde4aed86d5be5ee2988251e9a7. 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/TCAJA2410420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb80b873838d9e7a1e09cccbc0e19e796c9d4f97d0db7365af67bc483ad3313. 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/TCAEF1931445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f387ff28e4eadb56b863ef9138113d2e1f1b5dcf2b10152c4b0679e7f1bea64. 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/TCAEF1947631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec2f428f97fac0b50947f2aaede4cb9f5af88f0cfb1ed8e8446c21b61ef2d17. 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/TCAEF1947634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105cb65a35ea64b4f6823214074817f1492e4233fbaf04d2e35b7a636d97384f. 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/TCAEF1947639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4858173ffa3ae37e74b713eac22b0058599c7dfafe86c8d01058751766e836fb. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCAEF1947650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7348883632b3554a36823f14f1c163e39838971a0008005edd83fc0fd820d0. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCAEF1947668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf17440de5ea1b3e73bdb07d29ffcde46120a509fc1241a0835f45c641ee44db. 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/TCAEF1947670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6519b227859bc0eff11a846bd1fd09556a23ee91b8ef746c0861e81e694d2c7f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCAEF1947673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856f631e66c48783a4057a50788092a36ceb5ab216a444a31c4076f7b4fc459a. 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/TCAEF1947674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe089e4eefe40585e2dd38bed388b1d01c8a0feaf856a2e042135af9f66e7ebc3. 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/TCAGD2253471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa2064da7563a75451e9e92fca17b77d7f47549f99a367a9f717a53609e0522. 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/TCAGD2253476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23e18aea611988b6c9051dc21e42b140010fe89f0df488e9034f2922ed76c78. 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/TCAGD2253494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd767617bccd6fe7cfc8f0787067896ecd21c764e660244e39a7aefcdcdb30e6f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/TCAGD2253508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8338fbce2385681d51bf4ffd89b4a5cfe5d867f2287b8630dcc76061b0a535. 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/TCAGD2253544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ec7edd05b3112c287dda3baca3245774a5f4c8606d9c86da19b4a500c04c6e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/UKU6V2000133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b659693b68fd4bc58267b33655acb0b439fa4a551c6887e619882b42ff45cdf. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/UKU6V2000135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c8a66024d77ee93a8d08949d5d33bc4dd5d77286897d5cc53d24fece939e9c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/UKU6V2000126.