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 0x4a230756a8ad34f84f6af9b800b42bfd7ef707a80483f06866b71a19347bc8af. 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/12f4991c-3fb5-4adc-8a2c-069b11dc4cf3.json and https://artists.proofprofile.net/proofs/artist/12f4991c-3fb5-4adc-8a2c-069b11dc4cf3.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 0x935f8984d919107ef978e994cec8a5efa0dc0bc008c9af6fc54d2d8cb8e7aefc. 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/QZWFE2477044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe107057364e0efe6ff9074bcec1d4e5fff71f4c002aaa6bb21563ec5df6e5f03. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZMEN2377176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4042889d0c96ad1443411d48eb17165e58025192960f7b9c77b8a8360f5e154c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZFYY2432500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1755c0a85b65444e9f1038d68580d92ff69a9c3faf772d55ac2faf4e476d0d0b. 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/QZWFN2327744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc9afe627e5e5e9d99bec37ecd058c16a030a086724eb201f26441ddd413b9d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZRP52328776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174dd030eb2a7faeb2287eb274f36a4751c054f3e8bc6f0662df175e625c3c75. 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/QZTAZ2498108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15c57d37679c9c744e33bb687a9a41342b477b0be43c7bbef1b2d8cbd08efee. 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/QZWFM2459443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14b3251b63fca89b08a7830c0b70a8f1dac54d724014a616c138332662e4e2b. 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/QZWFS2498288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f69d909f080a0d68dfbed16ed29c5b5c7100c16e9d85f964f4d153d12399bd. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZZ782466980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87bcf20a3f345e96b270d85067f9a78817e1e0e0ba37ea5875293dbc797f541. 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/QZTB22267337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a1dc29330c2a70b144b35f204da03fd2f47be557506acf615f5aa895115520. 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/QZES72425468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c2d6c59af9dafcbd553deb099b819639c3d2d9df25e8fa4be5d3f3a9670041. 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/QZDA82598995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776f73783e176e2cfab54e18a7ccb5126baef5f5e11ab34c168a5189cc57d011. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ772415423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbfbef447d751619979df1b1684e464e29f4b540aaa81d979f825078154ff6c. 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/QZMEP2257504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9bb79831eb37bfc848b3f0c6c9005f97fbe4becdc517c87187784594fefdf1. 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/QZWFN2461835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76803d3221fb6cdb1d1fb645a911c4757a27247285b57136a86a309b098baa2c. 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/QZDA82598996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a922d7e1d6324b03cc7aba0d4495cb513313fb731a70bc6836c30444670658e. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZHNB2353276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351a209a6c1e558900efd985c5c4b91f1debd9a3909ec69b853cbe969c7d32fc. 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/QZDA82598997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef684c7d27058a346a83bb1236e900c3fe13dac1a594784eefea70246563e0f1. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QT3F32548020.