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 0xbaf83189311c6347a58c650395cbf9ca941242a950668de5e8a739beb126184c. 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/66553311-e520-4866-ac3d-e4c23aa620a1.json and https://artists.proofprofile.net/proofs/artist/66553311-e520-4866-ac3d-e4c23aa620a1.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 0xbe7883723c2713d47bf6214a827684e75bdccc13f4cfebc136e1ba261cbaff4e. 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/PLG881200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa646a5145de23c18f5201b959800c63110c95ff7da6075f36b509a653cff383b. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/PLG881200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463441abc7a49d2a36deda2b4c0ad615570ce7174258a4f97e507508950c4aeb. 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/PLG881200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6394bd1ce5ad7df74aeab49f8a2f1893f02aed6b7f7bb962600a5d1ceac96ad1. 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/PLG881500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542daf95a6b766cc9737b4034c606a0698b4cf10526d841ed883a0d8ecf4ab9b. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/PLG881500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ace8ca97e39e393e6923c3cb18cb21e97dfa8274e083b7d9e808497cb7f5ad8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/PLG881500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc3ba82c4d7cabfc38b89b226bbc862fd9bce7cbef7aafcf2a11c3f621a47dc. 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/PLG881900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a52168a4bc88b6e92c9616509e8070bf403cb719ce18a4c8a59873f2ea78a6d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/PLG881900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d4b33e06c7a5d506adcbdeb5f803274c561f847c00f4290176acd12cc04dcf. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/PLG881900016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bc7296ac2dffb8e0919f4d57b9c1af181156e826e2b72a701feb99e646e22d. 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/PLG881900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb5d1e30a4ddbda6c57dc638c4293e8bf377783fe76403c81d96a10cae07547. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/PLG882200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a530354004015f569626b1b00768bd591b49a880572de61b42d04276d21ecc. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/PLG882200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eef28458064fc718813cb72d634a2b28adb16e0c700ce2b8b1e7e94317c3833. 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/PLA550400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21a0214f31807ef65e9be07c743fe175ef48678d60aacdf59413c334f6221f7. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/PLA550400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd757c12f903220d7193ab27761e7a3875ee64a15edcd0512a937c7ba0af621fe. 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/PLA550400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b31336a180245abf6588815b7c5868e58502687ddde2d9346c817763add4de. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PLA550400039.