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 0xf3aa6e5a0750480fde4315ee36797e2bc6145862dd28cb87cf0ec54ff49fd699. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0a6ff623-537a-4f11-be30-118b73bfe3f2.json and https://artists.proofprofile.net/proofs/artist/0a6ff623-537a-4f11-be30-118b73bfe3f2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xc413ddc290ca91ecaa751e6624d14f64cd41c2aed95283ccc16426cf0c5ec04a. 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/US4KC1197303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04937096d4d98010e29b5728a424f3f3e2c543654b1f0bf350c8f2826bc3e6ab. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US4KC1197312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67bcb0b26dc49700bf2f40a3ddd59f57157daff6ab7cfb826304fe2268832578. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USA2P1235007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b2228a7b0e8af19bf011b1be68f4a4b67d38ae58e14addbf26d17d54fee097. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USA2P1235008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d2d652a85a5c1b1143d0a13731bee9cb4ac0b757f7b77446b1b187c0844d61. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USA2P1235009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e8e43924d07ed38f9caba6f69914839fe89f538a1e60932dd05d8c3b717c46. 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/USA2P1235010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c978cdd64defea1ac01c9c66a6a009397d391b58a08394a2887c16c049e0458. 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/USA2P1235011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f88cfb56ae7b58fb924e4a053f38269f7003f25c78bc9a0fffef80955d877e0. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USA2P1235012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c882b8405becfbd128cc8cc03b0d3334a3c20ed999f5f9977557446a4abe80. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USA2P1235013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0595a9f53b567d1efc39bf8a2e34164e5ead1d51c77b35a4ff2942de15849101. 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/USA2P1235014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a7575b24519c511b7230ba0f334a7fea20dd146f8f6eb553f0674f4c53ddb4. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USA2P1235015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b194f0dbf932ff6d342803551493efd98e248cd56771a0e1a5c4d6fcb1afe7. 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/USA2P1235016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc856e7c59568b018aab270246335346291a976eac0f378bff0c9ca01f7ad42e. 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/USA2P1235017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ba6fc5049a40ad307801bc69112999bd04cf9418150674e00047e1df7ffc1b. 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/USA2P1235018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88488fd4ef70faf9891102f9eedecbd286c63f3bbcd0e97af5723955bdb9ccce. 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/USA2P1235019.