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 0x24597b11108d9c7717bcfdab8520cfb3def599aa3fe265ed30440abc114fccd5. 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/274074da-6f74-4f99-ada2-eb226cab891e.json and https://artists.proofprofile.net/proofs/artist/274074da-6f74-4f99-ada2-eb226cab891e.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 0xa8fd98a53ee87080524a67c47d50fb19043589dd04d603ae31f1d761ab4f4450. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TCAGT2342362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b1f1b9e19e4a525230be567440c95d956160e187c0414db6604edacd085638. 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/US7VG2306495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5d315b4cfd5c076fa0fa1d3544760f8e08f9817ccac97ad30bdda4101e21bc. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/US7VG2450131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085a29582dcdbddcdaf26b0b4cf75a7c6a6bcafd239d53b8e556fef83bd30279. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTPX2474320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266bc490cd246a77e5bc43716bf1cc034d3f7944c5e935e1c6aefc46ef8706fd. 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/QZTPX2474324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6847e8800f266442d2006e1debb659b919dbd2cac98f03679c2bbe0a504416. 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/QZTPX2474319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7458216777d4ea5e17e956823e3b024294f667849ec6aa042fa76b81105f075d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2474322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d635976765fed908421512c1da4677f6bc75b2f75661249f07ecd1847590cb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTPX2474321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0a261682b1349b757d071416b5c56fcd087ef114ec2502abffd0cc1f6f2be5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2498705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b9dace347213935194367c64ca186e529904175f7ea546fcf3a00a1332372f. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QZGLM2501173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77373afd11249299c924c2a7d2c95e64fbd0517a6516c088120d18c71535b108. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZMZ92537696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff662d0360d50c40f484af62b2fa6d1261789013e0c45e5396f5bb67a854e4b. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZNJV2598400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdf2f5f4dfd588954d428043bdb2949c17119ddb2810a71fb8dc53d9930eaaa. 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/QZNJV2598401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8ad48c2f0cffcb40f4041b25d417161ad603bcc9de2b6c485ff4efd39984db. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZNJV2598403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abc1b6fc4a805e7de83fd2e51e67b737e978180b02ab0b945d48c00d9f526df. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNJV2598404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf89c88a8bf0d58c5e4912f5235ccdac2bda9c235394510bb130869ed3bec74. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZNJV2598407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d50b94375e2ddb5e8dfc5c0df474e5162957a1f8bca83dae701848628d5d91c. 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/QZTPX2588916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4feb82e0e01e119a6a96aae80858b1be5f19bec8cded983b7c54845309fed944. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZW9M2404488.