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 0x72e3baf2909d258e356b2940f35bdbaf0df797d627a12672ef9fb7f1bb85f902. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/739f9a71-3f99-4117-a1c5-480ba5b408ea.json and https://artists.proofprofile.net/proofs/artist/739f9a71-3f99-4117-a1c5-480ba5b408ea.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 0x5e90ba6f08fe2b0992fe4ba80c8b41a3ee4f3496cf43c57d45c4a3f250a31167. 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/USL4R2148896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d583a7b7f99e0e9fb36e024009414d94bef6ce5a33e741a0189ae1760d5ff7. 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/USL4R2148897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d47dd8cb11cffaf8d2f85e9d42d83e35fe5c41b4dd7b778f67640005b843c7. 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/USL4R2148898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc0fc81e6c1164d51a1c0b366d28145102146b55aa543e0a35e8127d5caebea. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USL4R2148899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb4241327839dfa0c9f0aab9aae3aec5e44c70f9db1e8560901a39258e16fbe. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USL4R2148900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1383a530cb820ca55e425dc8d1d7f36da94163cd6c9af1d39bbd670365c368. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USL4R2148901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e4fd5e10b7336d0d4ce6e29702a5649dcb9baa9afb3e2bfba370a9fd6d91df. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USL4R2148902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28342e7cb42f7dd6ed00b343c53ccb343c8779e783c22da33b8299cb6579ac4c. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USL4R2148904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7931a4247bda93380f0ed8ff7c59aa6aaf95fc14f0b4693f2f55911c5dd51ca3. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USL4R2148906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c249b53ec62bc023762f2e6ec9280bf1402a01bded914f0e1ccf57275c9819d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USL4R2148908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984cc2d67432e851c84da2e7e91e7e746c1470da2715cecf2332fe5dbcf2b5c3. 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/USL4R2148911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b5b32085f4a5fe5d86396d8c794424e0edd3e3eef60b208a1f2a9f8868317b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USCGH2025089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67df5a14314de630e77732292a8e517f81dbc230d99ed597a1ba69eb1ab3a6de. 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/USCGH2025090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ab6be2617cb73bfc556f1248af2931fc334e1462acd5870b8a3d378cca41f2. 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/USCGH2025091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2dac621f3ef5885bf2dd81ee9c5620c5cb9c92b730dbcffc0399adde6f989e7. 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/USCGH2025092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2672a86fbfeb97793627180cccf285c374dc309d2bbc7e171359718b88a30e74. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USCGH2025093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42ca1f17eb3075cfba275db88808abcd47684d3474a47ae67b44fcf243205e6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USCGH2025094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6feec034a349443ecfdb707a687284438650aa4896c4d5337034a88389d50344. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USCGH2025095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567251c2242cb35ba88b00dd94b0119396b7cbc5e6c8f202e7f0ac4794beeda8. 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/USCGH2025096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a0f7d998069e82f7529e6a824a2a1065fbd200dd69af4c616be24d75e50ea9. 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/USCGH2025097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea2adc394d85c3682b32d57c37513374d9678f9d3409ff631c442dea8670da6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USCGH2025098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab5819003bf49b501868c5c03f289a04de36c70403754a86bcdb276af05ea5c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH2025099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f7c2a10df3ae2a8b5ead2dc5241a19265dc8f87efe4058abcaebf8d8989fbf. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USCGH2025100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585b2893ef4e0e74bb643ec8397b418e3849bdb7dcf4bd80c8ee7c7611b428e6. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USCGH2025101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa854f1cfd9cbc98e51780af5e6a6b6b504b27967855399ec5ff375ff51d295ed. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USCGH2025103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1444428d4f8bcfb57542836f0b95f334a69e44cfb0844b3c9e586f294c648cc. 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/QZNJX2452583.