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 0x920dc8fd71dd4ecb5d9213a8732e2d6b3c46f43df680557df0774d25c0ed978d. 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/72af669a-22d5-4d1e-bc22-efa1a90244ce.json and https://artists.proofprofile.net/proofs/artist/72af669a-22d5-4d1e-bc22-efa1a90244ce.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 0x3aff2f7fda847c6a222bccf66e9be406c48c8204b3f3a02fc6dbf904d96bc4f9. 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/GBLFP2072027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827fe147156728fbbffdb24860719750f6f9497e7ba01261dcea1b451861bf70. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:39:15Z), 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/GBLFP2063684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0358fd8acd64c8152387ab1155f71b78b5d5b02ca1828dd3d3a7760275554bf3. 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/GBLFP2072035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594612e0995795c3d8d16ddddf3fd792f0cd07ccbc19d083427dc842882c1eea. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/UKXN22309848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x470e63a0003a01a1955e8c21f00e12f21a5fb97ebec6be25415aed8041a7ca85. 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/UKXN21909955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bfbf0a1a08ec2163008ca846c7ca15809f0c762757ce0b7ead443fe0c170be6. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/UKXN21936831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4162ed193189c83dc7a89ae5cb62443f44dfdce62d2800e86f70859ed1eaa91. 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/UKXN21963891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e4f7e70cd3ec62be8ce8683002f6f21b99e294321c3939cfc35402d25bb85c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/UKXN21963957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67be7c3f1744111e238348848ed89a9448aaa7710ad9fd8ed6cba92ffdea4845. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/UKXN21963962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb550cf780343d5a1a569a83634ee30bb13a07b2b4c1d3900f3367a876603a4fd. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/UKXN21964023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ad81a5dcf496e8b381c43287a1899425083057c2e9156c4328ab2272e68566. 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/UKXN21964031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1397e1eb20397336385353e1293ab42ab829e91f2e3577418a24469092c503. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/UKXN21964064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37969eb0d1a1c7a8182092796f441fa5a44416354bb7b11cde42237209953309. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/GBLFP2131867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714f1d19697d0f1aeeb09bdc7363a1eecec274fa27e3579edfcf9197ee6c3575. 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/GBLFP2131882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d003b0c146182fe8d590ddaca99ccd3a01da5f2d2b6e3585435454477ade6ea. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T09:54:13Z), 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/GBLFP2306214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318a77ab67e280343971f530330b2787092789e247eae9d6d78ea65968bda1cc. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/GX3Q92596914.