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 0x0d9e412c50239a52c4ed2e9b2eb32c7bd8661d1fe017b05bb23849064e3baff8. 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/a9405765-99d4-475c-a15a-80b1932848bb.json and https://artists.proofprofile.net/proofs/artist/a9405765-99d4-475c-a15a-80b1932848bb.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 0x031841e645cf0d7238bdec2dd9be59987e20d623d80116a84a64d11ed855de8e. 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/NLA271000129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658a9235196f3de8c32a238dda4e7a5a9756aebf9f3d6b0952dd7dedaf0f8aa7. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLA271000271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9eb7f7a835eed2c128db8a8a80448b855ca838ec5313ff155c617906943c25a. 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/NLA271000273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6083af68342358ab4082269b11cc6ca98a7c90726da6a40c1d643fae61ac9e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLA271200043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d1468b1028163591167c99ee92c407d22c3a4906fbb59bb18f5d335f339973. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/NLA271200048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227091258a80a62c5ab30a2631e9f163ba46d35b745dc3dbbdbfdfa6b034d4ae. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLA271200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb7f54c9ce0dc66c428dc1bc16d7d96be2134ab091f60701f5a0d87c9c15a1e. 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/NLG661700594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2d8eff63a7fbe33d385ffa8882a3373d366d15a73fbdcf88e10081d55589e4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG661700425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1164e4be238bc8e3629b4aa151ace773fa184e2a334f997bcea8063fbb2883ea. 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/NLG661700595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a83f4795eb7ba3566ab812e77c35f7b2c9006c865824e51faf943a94b11271. 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/NLG661700596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb3b082825067d0aba0e48fea838cf96125915c5bbc19606afd09654716e9ec. 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/NLG661700597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c849a8edeb4b813380c66c9e01e0c6b319b0a1f126c5fd25a6e760d9d00650f. 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/NLG661700598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5b9e5420c9030792399db772ea048ad61e3451802dea52fc4840fbb00ebe80. 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/NLG661700599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabf5ba8ff926901fe3164a90cc679b8a05eb5b59ecef933c91f4fea0ed2ff03. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLG661700600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45011be9eac39f874780bde41e33c7dffec60e58ba73c70eb25901ccca72b7d. 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/NLG661700601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28670954e56cd3a75e2453a7c70772dd1864333ec9cf0c007dc42b961f5f2244. 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/NLG661700602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1452678ed6b24918192be53d329a5db1b8a3725fcae24d10555f222fefb6794. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/NLUM72000411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b415cae227db04440fdb0b5b294d49ec3b5d6bc6658a0720390d5a6d9c41323. 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/NLSU32200099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08994c86d2fdce074a7339c7df094ba03dfb801e251733d3f38571a696a1586e. 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/NLSU32200088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05d3cf544abd75ebb6cffbdeda1ecd1a7f0e6f10c8a6f4888862a80273b124c. 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/NLSU32200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231c189baacf77e18e3d7c738dc508bc1de017e690b3a9f355f20dd37abf5ffe. 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/NLSU32200083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb244c5f9ecb8eeae0e5722112b138308148f07767f09af86be7dee8c81b1ad3. 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/NLSU32200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b9bb901b104a460c1649dfd0b53c558ba22974c88efbbb0b372c99be7d65a2. 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/NLSU32200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627f058f6a392d5c203b6855071fb26b3087f5720c786478692b6a6c8529fca7. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/NLSU32200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a284a6f553ce3002bd956c8c425b9cdaf818a81b2479a66fb91e9fb1e47122. 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/NLSU32200118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3ee9ef2de964dfbb0b25c4fec024ef0bfb95957aad4c211b979cf4bf330e0f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NLUM72300613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe973f0d1d5782cadffe67f75858e33568567a8d06812f0a5f1b641b8796fa4af. 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/NLUM72301056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f981dbcc903d8bb228647dd6dc4982a81054438f3ce694145029f4ad2405b0a. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/NLUM72301065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75666a76c3db664110ccb6200412ecb6681d13bdedb2779b16a64ac6141a5ed4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLUM72301067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3ee9ef2de964dfbb0b25c4fec024ef0bfb95957aad4c211b979cf4bf330e0f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NLUM72300613.
Beste Zangers 2022 (Aflevering 4- Nielson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05d3cf544abd75ebb6cffbdeda1ecd1a7f0e6f10c8a6f4888862a80273b124c. 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/NLSU32200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627f058f6a392d5c203b6855071fb26b3087f5720c786478692b6a6c8529fca7. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/NLSU32200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b415cae227db04440fdb0b5b294d49ec3b5d6bc6658a0720390d5a6d9c41323. 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/NLSU32200099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb244c5f9ecb8eeae0e5722112b138308148f07767f09af86be7dee8c81b1ad3. 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/NLSU32200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08994c86d2fdce074a7339c7df094ba03dfb801e251733d3f38571a696a1586e. 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/NLSU32200088.
Beste Zangers 2022 ( Aflevering 8 - Duetten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627f058f6a392d5c203b6855071fb26b3087f5720c786478692b6a6c8529fca7. 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/NLSU32200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a284a6f553ce3002bd956c8c425b9cdaf818a81b2479a66fb91e9fb1e47122. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLSU32200118.
Beste Zangers 2022 (Aflevering 5 - Jaap Reesema)
Beste Zangers 2022 ( Aflevering 6 - Sarita Lorena)
Beste Zangers 2022 ( Aflevering 7 - Ferdi Bolland)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b9bb901b104a460c1649dfd0b53c558ba22974c88efbbb0b372c99be7d65a2. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/NLSU32200110.
Beste Zangers 2022 (Aflevering 2 - Blanks)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b415cae227db04440fdb0b5b294d49ec3b5d6bc6658a0720390d5a6d9c41323. 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/NLSU32200099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a284a6f553ce3002bd956c8c425b9cdaf818a81b2479a66fb91e9fb1e47122. 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/NLSU32200118.