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 0xdc61cbe671a33905ce7d273d33b54cfa65e890cf82532fcf59c3f146db550bdf. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2cd7add2-9b00-437a-8a2b-35a5a3dcbe5d.json and https://artists.proofprofile.net/proofs/artist/2cd7add2-9b00-437a-8a2b-35a5a3dcbe5d.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 0x6c8879249d949627eea8dafbce8ae918e3db97a49029cb71153199f362e378dd. 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/QZMEP2335853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7df3676b7715cb4731c5fe1608c87931b62469600ee23620b033668e3a8bc8e. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZK6L2312903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a40e430fb3e4f95f1622cfd77033eb1efc8d1a0614199cd0a11f28ff535c8c. 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/QZFZ32380431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a67c032fa0d6f785f224b976eff7747e23013efef5959436fc6e96b39c4e44. 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/QZFZ32380432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb71387690f3d41a9a060415db4b7bd7465ff65bebec17e169844206f1fb27e. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZNWX2241675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6273b9c5f6424ddbbc19305d59e44284012b8b7e1cbe861c6c04c6c85d14e7e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZFYX2127478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6da1e570695f411b1abf7ec5f7c08369aa734dee41d11f0bc7c0bb55e922413. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZFYX2127479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e58af74a9f226719f612b9fcb478a23551050e25c7d63210e779b1c32c20d8d. 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/QZFYX2127484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbfc01d99400fadd91a96ac7395de608d6c2da391269f9c8f88d8a53acaacc5. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZFYW2191859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd928541b6b2cd16d33e5950d8a71cb5b005c1ea56d509bb642883f50c8a6fa12. 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/QZFYX2127487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c7ba5731694381cc81a8ed1db32d304454625cf62f0d7f9046d48cb7016749. 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/QZFYX2127489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15481e1d157121f2732c59624e801da677c45ecceeba4730722158be60455937. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZFYX2127493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224d165941b64ea89290da637f026edaca6ddb760aa8559bd38627e73f37df80. 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/QZFYX2412986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15df09bb6116a39cf88edf73d5b171e7cfdebe9c4726f6ab4336fad91227d0df. 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/SE6TI2389857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1931a55d2a13d74c6208404773e22e7df0bc36cbed2e3d06ad309066aca560. 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/QZDA72224963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef44af8a0d9bfe8f8647ae1a91443bb5929b706bcc1974bd2be71a5fc1b8cd8. 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/QZK6Q2164435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cafe53586511534400a92d2f0d95407984665072556ac8cdde590b34c98101. 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/QZK6M2083701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7398f15b60229ec477025db68ac83a77a03c9fe82117d547ca14012381e8da3. 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/QZHN82066483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5953d74cca3e08483af0f844569c26c1995be7355b53ef22a68969d356e580d. 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/TCAEY2016417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e99186c509d66010cfb1804e1ae3ce1dd821029b1ce6087b4b8a5669b3c53f. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/TCAEU2059525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926b3c004045c61a33430a06f6c7336a948ca45d2ad1e3173813e7f806ec14fb. 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/TCAEQ2066090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8151428225455816ffc17bdbd510cbe545ee8e25d41a80a184325249071685cb. 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/TCAEO1969916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c878cf494ba223365073144b7df940cecadd8190dfbefa0bc41d5987d99593. 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/TCAEM1929965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1051ff7b0efa355dd02de90999cc47256dbcfc114023eb9f835d224896f24593. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCAEF1915407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04dbd12bdd079297c530d11ba55db7aac0935d82b922c329d190124ce7c4017d. 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/QT3EY2483742.