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 0x87bfd8eb86b8f4d8e4e3cec5d9f6f4229a26811fdba90a4b8f69147f54ed47f1. 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/db0516ad-349e-4f3e-8c4c-1c3b1f6281e1.json and https://artists.proofprofile.net/proofs/artist/db0516ad-349e-4f3e-8c4c-1c3b1f6281e1.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 0xbecbcee7621fbd9a6abf2fbc310652c175b1795c695feda35013d505f5072264. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGH2472829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2d88ca5e4d1685282395e24cb0d660e12aecc0621bb3488e65433927c9b009. 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/USCGH2472830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363559e6b1822bd43abb36664e53691f545b6f0f0b6716a3ac592cb0e786474d. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USCGH2472832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbf8b1d627dd2bca9588f9e72c35fb1a6a8b6de889d9b1e57111d8c6c22415b. 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/USCGH2472833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0490658493e6755155c127f8d07632d52a41b55dc34c76e9160a44fc03e54b. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/USCGH2472834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22eb17af9ccb675a9ac6a7a0162a7829bf941280743e582ca5f78868df1cb2c9. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/USCGH2472837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9e64ad41f9ab478653453966211fe04a331b02025d91c92aa9c113aa25e049. 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/USCGH2472838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1129f2e71bd16a1403068ec28e739c492f729f4a98b1b1eb3c006b31190b477. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USL4R2413100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db769b329bd34fed228d66a30984446eb88e8f71722f1ba5b1ad0940211df86. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/USL4R2413102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc5a45816e98e432498312d37f3648ee75a9ed249f61c44f8606dbbf7ea26d9. 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/USL4R2413103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21bf2a9781c2bd93653c04d2b363660efe499082afac55b2fc91b3e2cfe7197. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USL4R2413105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d3a0d29f2dcb64a7321cf16493a89ce6cf07d6e4eeb25b71ee0f6c99635441. 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/USL4R2413108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8641d366f5f8eafd6de7613e86adbd8cacaf2ff9259170a68d9aa07acdd147f4. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USL4Q2498942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec1f5672db9c643a7151aa65af8d83827b0e32410a2d6608e09dcff09ec03ff. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USL4Q2498945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8834186c467fb5d5902b173ec02751132bba478e38a766fc186c929c5eb6a4d9. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USL4Q2498948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca591ba529d1618dee48f852c3778d2e6d84af84e2d3940b867fa1f5409110e. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/USL4Q2498949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda089e4cc7d798618ebd3f675a80a22ba78a45f893215787e0d66c3d352ed99f. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/USL4Q2498950.