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 0x1581449a7c13b60707838114e034f0106d7e17eb129c5f58495b4458a5e94aaa. 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/891b3252-3b4c-4a2c-867c-b07e1440f9fa.json and https://artists.proofprofile.net/proofs/artist/891b3252-3b4c-4a2c-867c-b07e1440f9fa.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 0x55d5900aeb0910f34cf5272c8a173646d2876b920121ae8088a2fd2932923544. 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/SE6I32369153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d93428cddc5d03f54033c1c1f566313713a6da3710a3a78702cd6e1d2ac9acd. 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/SE6SA2381068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1a750bfda04cf1bd3d601e63b1f9cea2a08f70e3c2b6506add208c3596a59d. 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/SE6XY2369611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c645e03d88457d41ca966d2196acff6c89d1ba036c4a7d1b6a805f3b563a66. 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/SE6XX2366897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a7a500bf33ae03a9a08dfc02472954ff687eeb3c20db07d6ba4149cbed3d94. 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/SE62M2386615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4a853986bcf25a7cc42245930afd934e64e08994161a30e2f163f4164f2e0b. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/SE62M2360152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda73c0a33c8c868014d1115301c0aeabd231f379d5cb36020f11030d9bb4c7c4. 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/SE6I32492301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6f81d7a132fe8f5fdb63a42779368ad1a617fc6ad8917502c3458f3ac66295. 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/SE5BU2494954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca258ad8baca3c65c7fa12b1fe3c73f65908944821db68b10b50ca9d04e1ce9. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZMEM2410938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec6379c210005ac1f332fce0dfb11d65a7ffffe0e907c14668047c0f1284c39. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZK6G2464512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb93dc21ab2983fa95d42277f1ff1c35c5e213b6a7d867f5f291ed660451a077. 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/QZK6Q2477361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e317aed33258edfd7f51d17e0c7855798e82aee127d8ff746c856919cf830a6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTAU2468468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020a93f2bff5c6804701608aec68890f0b23dc6a1026960bb724cfcdd5ec9a34. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZTAY2490800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6621e2a241d539592fdfadd25dcd8bbbad459d95c0d30f5e3a8546ee582deb. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/QZTAY2490799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020a93f2bff5c6804701608aec68890f0b23dc6a1026960bb724cfcdd5ec9a34. 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/QZTAY2490800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7ef38bb12cc58a4ec60482f73ccdf0bd91e76ca2685fa0f0f4ccf2a121ce8a. 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/QZTAZ2411259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657b33dc4d0306c697d227d74604c5b7699ebf08a23d470b2728e93d37698b42. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZTAZ2411260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff7fbc57881a701113b551fd98bdd89e478bd319bf40da8c181c38c57abdb77. 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/QZTAZ2411262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452a2564e983aa5054a83278a8570ba7ea45c3a9ab101066b37c2b336e6cc72e. 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/QZTAZ2411263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5df378696e418e434c78dd21c5e4996152be5e1ac830ee58083d680795ddde9. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZTAZ2411265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e048fd9e9b47bd7016e646391df3b0fda2548feffdb3da0c8c52f8fcbbf0292. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QZWFT2411940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e176b6606115b9100884c95aec697f6d8d5f36f7ac62db351c0e2ba741aa2e. 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/QZZ7V2483007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797435561ade83ff0f82b000c7436c6c96e06a90a39d2371e2ecc76f4c792ec2. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNWR2511255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e220245054cb7e1b47f22d4adcdc8141bc53d240d8e4cdb33e6db113e6a23f6. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZZ7L2559534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c7b6b0cbfaf5b2360e48abc6c0b75df08ff97af814023cb45dd19ca5f366f3. 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/QZZ7L2559535.