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 0xf1856f26c8693f26c70d5d55d67582ab59343454be792e58bbee00d6dad046f4. 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/9decb539-c130-4850-a5c4-6f9829fb8f34.json and https://artists.proofprofile.net/proofs/artist/9decb539-c130-4850-a5c4-6f9829fb8f34.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 0x2d3a9cd8668cf657aa57989e7e388509b70ad5efbf16156fba0c9d4cc69a08de. 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/QZTBC2357672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8126c24eb598a1eb47f732f41a234d757bd48db51d92294b6c47b1bdf42ee0. 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/BCNWM2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912a1b105eb52d729d3be519f4f4c56dd6ce62fe1635b88a89e44cfb2dc1e640. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/BKJH72300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccfe5c86c1a384a0ddf12061c70c90408225209f431e3657bc3b4ef81a1ceac. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZW9K2342330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1be251f2d9ef80a7126f8d21756e096270786bab06f82a0680c3bf9dafddc8e. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/BKJH72500038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eff876731fe08654b0ae1a1350a0bebb662392059bf9931d816551a75025208. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/BKVSN2400098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229823a1de913b9cd9f4fa6624b25d2d7210067c0badcdd6c5aa75b518700292. 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/BKJH72400133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5680c0f4b2051ea833616bb303bc35b6e6ccf349f158d3c3243728a356a56c. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BKVSN2400081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1008afc825af27284dfd99d18fe57d1c3aaee78356a8484486fb0750f0360ae8. 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/BKJH72400167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbddb863ff51155ed666cc62a675a540bb8bf3873d9c1915cd4706b114a7c4059. 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/BKJH72400062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675bccc35bea1e0bf5fa8743dc26e392640e3b63f00381cbc26bf8ae0293034a. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZMEM2183172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8052f31e2839fb75e7a6d0ad1ea0d14af241e7cde0a31d54aa95c3fecc0fb778. 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/QZMEM2183174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8caa52855de4e19136156e401d3c88fe0e1facfb919f6fe18fc6eb0f04c82d8. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/BKJH72500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbccc09f854b013b81a2965a8f3943f3041b97a524c647ceb8bd057327b214896. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BKJH72400131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ee3bdb90eb0ed3260c156068893bddb84e0a3f8f8e0b2d3ff336465ba59cac. 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/BKJH72400132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091db9cd06beeb41e90c58745088170841990af9de1193fbb6aee398564409e8. 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/BKJH72400114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b08d2c70a7434f544241b814e2b944b23d76711528833a318ac2488ad1a669c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BKJH72400115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0808f85b259cccf0673daf431a360c626d9780999ab3ded075d3b9c49e85580b. 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/BKJH72400113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a681f95acb7f6347eb7d6a41ea85e0ef3486eba5a3521ba39cddc5586a1281. 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/QZTBF2453000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621dce306f07ac13752fb75b5140bde21cc8b5fa866c086727209116eb12aa39. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMZ92451776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b4495fef48d36f95f312240094e6b1e35eee782aca1218098f6d130d7c00ee. 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/QZDA82493240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120e8640901cd39f4cea0043d09d2c90add0edfaf56c739064819aa68c4782a8. 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/QZW9K2342339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276db958ffa4f05a7c554d2390e6936c123a18e11bc64156b193b4e33e6a2688. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJV2396110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5230bad04ee113e01175320698c044ce8e74416edbdfe1d41d8727f5cefceb. 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/QZK6P2378211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee857d0a254d6ed9efb480588013d11f6afb42485cfc41a2f20eff17e557bbcf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNJV2237701.