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 0x252bad4f5aba272b7a88fbb44e711c561dfd021f36203e5bb8b3b285f328ccf2. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a8afc31-a335-4a2d-b726-fd19f9e1ee17.json and https://artists.proofprofile.net/proofs/artist/1a8afc31-a335-4a2d-b726-fd19f9e1ee17.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 0x55fecf88446dafd6425a02a808d98c56bfb1b9039bc4f491839a65340481fe08. 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/COC012033558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc449414901a5d0ef6b22822d0c997ba9c10683bbfc7aa8ab4501a91246163e8. 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/COC012033763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6467fcac318f115cfb5b44a3132ac4b98893342d465f867f4a9429c26fc7e3e. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/COC012033913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee23460d9810e90a91c8087aa0fd5f3198766cceea5650d61beb4d3b08844d34. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/COC012134597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca709b0b3f1e249209530aed3ff1d80761757f42893659ab093b5f41bfe7233. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/COC012134716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb814e2bf02f24091f8dc1aee678e83ee0e805f4f24e2bdf764d4a7b5d81126. 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/COC012134862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927800e69e65d3432b3a6fd492092d9c1c06b828ff7a476511986e0706db107b. 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/GBWUL2409383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ddef7529221b517a7c136bc45ceab5a5cea7f290e7ce36607579d1bec703a8. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZWV32549600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85d128ee71f08d3ccf79efc50b3903bca44a41501a40754f62576e964e7be3f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZZ8A2523477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f487128eae06f1d741b1480c178d3767a1d2ef0858ecbe881453bf7cb891ff5. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZZ8A2510898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d8287b82a01b2d6253ab8d7ec88898b1e45e22e7b73bde3ff5caea2b6c12d2. 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/BK4DA2311430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db617d038a35f74f8f7d5271995aa513bb54fece4b1735bf534634177fb503d. 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/MXF152100068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b740777bfc1614edc1f09ae62d6c6e4af598f48fc81c0512f2a8083574eb2b2. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/ZZOPM2112972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4993b792af2431cc737f8d5d8e78fe22b72ee41aa78e73eb83b97877867b393a. 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/MXF152201206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6570449af4f45419ef813b550475c6359b51c12a2b8a6ff2d56e29ef319790ac. 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/MXF152100748.