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 0xc8d33ce206ad88d032e89497f13bfe6c512d6882d683482509e71d21699a7c42. 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/7db9bb27-614b-4a11-be16-803609095884.json and https://artists.proofprofile.net/proofs/artist/7db9bb27-614b-4a11-be16-803609095884.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 0x65dfe65f627c7defd537778e264a09f3e1da28c3f6c48419b3e1e2d260d8806e. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/DEZ651300389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cb60d0b31db874d1fe4b1e7f4c85c050dc7f47abe0b94d16abbeee6dc3879c. 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/DEZ651339859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bd763cc7afa327d7df27df6cc724f2be4cfdb0addc889ba5ab63de4fab3ce5. 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/DEU241604360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cef24bf602b9802f7bc06472f16393f7114cf73c7e2bad7258b55f9f20f379e. 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/DEU241604368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196eae94c6912deb7b6c2c8ce3dc3d77d4a592fcdd62892593a9692a61c8ab38. 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/DEU241604371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf26111e0944b059d79924df98ad8df1c8a786f723d47e8df1d7d60847ff04b2. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DEA451801050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d7615dac078602ed6599f6c0de8c3b25918725d7c00ad8bf75292298502db4. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/DEA451801140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1df79676807b06b8e649f9669d549ab94f2b052d4c6e8aef560adc955f2139. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/DEA451801150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb7396f2297a48882d79b8603a9e237e3554c8d3cbce02670c6f0599a8bfcfa. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEQ022011502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fbed25130bb9f4b7f74ae7903926a9550d88598d3c8acca694822c1026a4e8. 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/DEQ022011504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afe508ce2c7d489b8bb549f9251356ed9048d91919c8a6837c11a9801dc8a9d. 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/DEQ022011506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bbf2dd60603fc20136be2de66f18532093740feb083f81c1744698e31d6d0b. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/DEQ022011507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa3827dae4ea7b56bcfe5aad18f92ccd665501e3e393da73f17e70bbce2d799. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/DEQ022011511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb7396f2297a48882d79b8603a9e237e3554c8d3cbce02670c6f0599a8bfcfa. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/DEQ022011502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4064227cf45267d50aa4bcefa45148734f4b53eb94c1ac2da5426b2a87112da3. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DEQ022011503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bbf2dd60603fc20136be2de66f18532093740feb083f81c1744698e31d6d0b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEQ022011507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebac149c13f31635b710146ea013f84f0c4999b0431c231025d21d9ae813bfba. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/DEQ022011508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f0e51b42b1ea3c189636f00c8af0c255f1ae86e24a416fac1b42bd601011d6. 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/DEQ022011510.