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 0xcd6156181d4955a7555b51c11aa87171543c0874b629976f5eaf93508bf86405. 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/3d840dae-71d5-4904-9301-19c0340f9b7e.json and https://artists.proofprofile.net/proofs/artist/3d840dae-71d5-4904-9301-19c0340f9b7e.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 0x8ce2b3d72b35b106d2a1f201ff47a03dca4e32976baa8ffb5aa1355b8ff7be76. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZES51917229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2be279f2b2dda2338703439fa85d150af948e327e909fd52032e0dbe3c269f6. 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/QZFYZ1918118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x365e1fdc8bd6a1e9366922fd1ee3c4d3830fb9f2ff23114fc34712f7f016a87b. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZHN91927535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28c4f5fb52bab9caefc9e7d5d839ce74fe9b7a6d510578f3280a9ec200ee454. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/NLSB72100191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0551fe1418029d82685c12546ec50313373fe9feda513c3563c6c89310d243. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/NLSB72100239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d0a990b80456aa1a21703494b51f9f6069fc70e2026b28b352ad2bf017ab1b. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NLSB72100259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06d39b8a61ff72861c0a52f78b528d5feaa0a606d6e51dbc14731af9f4e91d9. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/NLH172100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46ed0cfbf4724cecf169fe0edc6496ba82ea2130ded87ef336be15bcb629096. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/NLSB72200630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b58a08189538ccce77d1e0266f9fc1c348fc9fec35363d445d2d5306debb73. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLSB72200772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd0f6115ff356d88dd319761b9501a1e696d4cdb4c0f13e6ef19b6a3ea0f260. 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/NLSB72200849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa70f458322a5e9a20561cdf05a891066a70ad9fe5828abec97dba86acc381f. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/NLSB72200968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8d08684b3543f831a2c73b0cf83c2f9957bb3be052a9c032ed8d82b30f10b5. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NLSB72300222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16324566e899908d09043aee521fecf066fab5d3f95b67ec1e95f67b62746f8a. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/NLSB72300296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c0c5c5dc691746f1dd757ec30108cf187822c52287a63a31cd61b3f4592a15. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLSB72400262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060b3f03e8155365573037fa04dd6c541b59dd83f8a9f0a648c8ad7eaf1cbd6c. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NLSB72400377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4270a1d790554b8df8ef6c42d354775545e9627dfd4436537d1d5a24e5fe129. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/NLSB72400560.
In je eentje lukt het nooit, maar is dat niet iets moois?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4270a1d790554b8df8ef6c42d354775545e9627dfd4436537d1d5a24e5fe129. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NLSB72400560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e81ab9c314b35b7689d35a5e948d1a1e3ba2c77006d1daab015f13a2477980. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/NLSB72400695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da9283989e3394cd400352dbb17e858f9ccde36934f323849bde5df2f0513c8. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/NLSB72500106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060b3f03e8155365573037fa04dd6c541b59dd83f8a9f0a648c8ad7eaf1cbd6c. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/NLSB72400377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8cf69a7b753a9eff0c547f4ac3343f48baf9afcc9324be7fc1bf0f4da5259d. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/NLSB72400321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f800f3f1b33e356bfde632d60f45524d5e1967979401978f6d871407cdff1b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/NLSB72500157.