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 0x079a33ff66a683fb58a0909945e025b6fbbf424120825e574b988a30a533fe7f. 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/16038a7e-bbae-4c68-962a-14fc5d8ebdc4.json and https://artists.proofprofile.net/proofs/artist/16038a7e-bbae-4c68-962a-14fc5d8ebdc4.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 0x49467196a464badd30b10a5c114c727376107f77fbb39eee6395a2a4f2307fe3. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZK6P1966436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c51ed22f452c20bbcfdb9f748c237a4bfd6c96863b8b81a4661ee9965115e6. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/QZFYZ2015222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1c137939b4512633d9152b7968b03b02f8d9f843087845120efc558d1f3c50. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZHN72067926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a311e80729be943ea5b77baa23c65b1e97550dae1e24151dcb9e93b0e00e1bf. 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/QZK6M2055287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6217e57f5aff8a78da5ee98feec016bbb44409df51d786a0906df538825865a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZES82215844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd188d69762a99746c32db051ece6e75c041f40cf1bf136b0d742a2f9af8b9304. 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/QZK6H2285383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4747dcf3ef7e894b9a2e1fc5b1d1bcef2ae690152da6b53655eb403228eb380c. 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/QZTAS2247734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec171bb3b1b218bb70ef8113b7bd6bcb2cd579abcf46c22fd519dc8f96e7619. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZK6G2381518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e172b99e46f238d3cc69e4ee5b8340f3b9eeeeec00af57ed3bb691b8e6881f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTB82333232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d34d531903d5a4d1e31ff5c631b1db213d9e58681c1239a5cb2f8303daa0ed. 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/QZTBA2447212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea19df94901efdc2736a29b4ab0a33778554c5e903f1adc2f08e2f37f2066dc. 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/QZWFF2485555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78f28b53f7f49a207ad9d5891fbdb0f5bf0625d8f3a32b1cd10d8feeeb5425e. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZFYZ2508464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4e174e4c5975355be2232e7f09d4d43c82250ce5d05351d4f724e40c647193. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZFZ72588564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c54393c4f4588677d46673d947069d7e731338be81d76cf7a0d41c443c97dc. 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/QZHN32571336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f20874df46b08900e0933aacd469ca48857e4d6c108226104e79cb835fec056. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZHNA2545106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb442052eb184fcbade2f88060c65c0a7ae5f52e1f29a145d5f9bb80cc2e751d5. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZNWT2530341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be2ed6f9e366b7b1b17ae9b8f4d5e5f4dc0da85fd976894ca3c1627ebe19753. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZTAZ2542800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867c4609291e7b0ee975d53f518cc31e14423cdd37680249368726c1953d018c. 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/QZZ7X2512523.