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 0xa90f934ec9578cf8a28fe3b1333a95168b8b563d6884e44a7fbf26b330f24f9f. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e4ca73e7-834a-4ab5-822e-a8ea3e3cf7f4.json and https://artists.proofprofile.net/proofs/artist/e4ca73e7-834a-4ab5-822e-a8ea3e3cf7f4.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 0x9dc30bcd91bce4bae9b10d704af402e6875830a211e56a511f87aeab9518b818. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZZ7R2502116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280762ba6bf07ef72bcbe610091d0a53ba33a5420b2d81f12828d59ef630b621. 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/QZZ7U2577311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330711a49ca5d5da832289ba2ebfb902e90d21c3b019bf73f34db79404bd6b5c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZZ7U2579836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0bd7a5bd22a66e5f63fe2efbe8151ed14cf55d62651feb0f555215847674aa. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7U2595581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc525a466be1e2a6917d88725300072b70cd81d485d7336565b7cae63768d56bf. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZZ7U2579837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ede5b49b7c36d2c84e3f5988d92fabb9ed6b20a98f6a711db0b7014d89578b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7X2526157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9100473bd3f41379dbd50826296ce0231ad9737803223bcfe125cec00804db4a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7X2526146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d8189da4be8454ed383d5e0cb3bf65f2b7d985d93b33892dfcb293e38c641c. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZZ7X2524245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c779a8ad087ad97b6316c0afac4231642a50daf424d8e22a10e0d057b0a0e23. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7X2526159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4458121d37a5a53d121b49b14aa67fa640214775da9e2b1221abcf620220705. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7X2566081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25490afac8ad116cdc20a46889c61558c503d94130c9f012460838fb91f9c8c4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7X2566186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c359e070c9b78e495d6ff6740c115fe008641a6f2b2d6de7006429546e80481. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7X2570080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9b9d9317e055dbb68e8c52c4716df5dcf82e298026037c75fe025b3c2ea283. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZZ7X2570082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1da30d2db149d57d61602dd858a7b8d7499b4b49272d2aa7411cff549c39287. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT3EX2522401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3798993084df9140bb175e8ddf811c1fefc5f5bdde3b81c48b4aa06398be5ab1. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT3EX2522128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f04714432de108cb498e339f3d8e7dadf642d1262c421a1b2470c0750dd65b6. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QT3EX2522217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fcd3a6ef8f7568c604d9963eacf574274e7cc0be1680dd80a31f7bfb4b518e3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3EX2522042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9279537ee583140d9f0e1c0031eb626c963ba4300feb4d7f55ae91dcef3b2e3. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT3EX2591210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef9b477c2e0372e6d35bf1f93ed1a276d030d6319eb021837167665f9f420e2. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QT3EX2587984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98daa9eb81c995e2bf839165381a5d7a7add0364c4649197379e12c7b996bea6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QT3EX2591207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9c9921b5400af9deea3c7fea4375abc8af326feaea55f522c5ca6d22e86953. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3EX2591205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93f7ff49f7fb185ea03894e7bf110339945f9e43e2bf8826034a021a75a9393. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QT3EZ2532509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bc046b5089e05f47230568d8b551fbe61a7f490c7f1fdc4de1a5c5078e0f68. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QT3EZ2530635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d0714ef915cacbc4868f9e05e110d3a513330aee061116c39461372e790109. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QT3EZ2532529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4a93d8e26cb58554063afa9d7d5a804ee101b6667f2f14efcb8b8e99a9e9fb. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT3EZ2532532.