150px|thumb|right|class=skin-invert-image|Euler diagram showing A is a subset of B (denoted ) and, conversely, B is a superset of A (denoted ) In mathematics, a set A is a subset of a set B if and o
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 0xf2ef0a47b2a8ae5692d3bd937ae79943ad5b594057d9efbb32761d24d188af20. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/768179b8-f308-4b59-8de5-21f8e68a4f46.json and https://artists.proofprofile.net/proofs/artist/768179b8-f308-4b59-8de5-21f8e68a4f46.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 0xb5347e4dab813879dcd81a9cd5a36deffb63f0d09ea837deebea58ca4a218b78. 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/CH6542223206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24141b50074da475793c941e27c477e79189bf74f0d8f138ee56e4cbd16b666f. 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/CH6542223211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e9962fd5a40b5468dddb11c100bb033319523778ad6cf7eefa55d95ccd39ff. 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/CH6542223207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26eebb78eed48b64f03697a4199fc1d348f3be04b7b4af1b1032ebc98deefb90. 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/CH6542223208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a959fd932a6afef9bf897e520037e309d978918f409406d9aa506c0b2894f0a. 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/CH6542223209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93968ca1a3f5d160e72641b26dcc32b4a43a9ec708f446fe309fdc5213462828. 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/CH6542223210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f7cd3319d92511b4df1fae567eec983314984764ff224e851409c7b0bdcd09. 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/CH6542223213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6b317dec7e93c70d0e629a3ef3c731ac8ad8a56d6a689d3c604dbb436ca832. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CH6542223212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cffcae0f478802601e9960206ef498a49d1882ce9fc5447331c61a8b7522e0f. 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/CH6542223219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1413555bd2e1bb49f209675d444a448e808e3cf401f634f019a34e5fb040c8. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/CH6542223218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2674f51c9b0f0246865e98d57256166a4f27649941c57c825e6169b52ee944c3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CH6542223217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341f41cb5176b92d7a326ab08e376d1d99841f2c87a2d17f79fc2013fd58b9c3. 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/US83Z1772486.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba28a053f4fae793154aa37661b4c8aa0ebc7fb42416fdf99ee7fa7379468ca. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US83Z2103228.