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 0x000584a9d84756bff8e4bac35f795795b261596e9fbc2d52ce4f134eab018b07. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b58866e-16d4-4680-991c-a3ff5d097492.json and https://artists.proofprofile.net/proofs/artist/1b58866e-16d4-4680-991c-a3ff5d097492.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 0xb5b97eeeecb46baf670855ddcdc5759db13219ef34f0180d869a6cc776646988. 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/NLA270700352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465858bea89c01f6b3ce942eca40803c15c2966da41d92146af4cfe49bdd8b37. 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/NLA270700356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963e38cf7f4a8329e62b8dc96b0093d426dadee456793482f127bd9c5b53701e. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/NLA270700359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd549e4a430337eb96c02077a877382deeebf79ed7de6fe428ca0ec61d2291d. 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/NLA270700361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a629b40632e6cd8e2bd29d36459ce0789dd7533e4af5cd4e6dcd4ced9e116f1. 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/NLA270700373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65517365a05f0667e940a58c132c01c01edc56737475386c268c545d43fea624. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLA270700369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a943c48335b3c51ba0faedebbc0f386b0e5e530b1b58bc43512c94e165f703b. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NLA270700370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa138158cd5291df7ab3d2eb8638d742bbc1ef17984d2391ba85d5810d2c72bc2. 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/NLA270700365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995f64a60db50fd4f118c53f0f03dc7a2fd8064a4cff086095a540a339e468bc. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLA270700363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd94f263d0b5d55765d59419d14c21421cdd7bc6df6c66c955fa4d1028a9b640. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLA270700367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d7aedf8dec52ef8772f7d504ae878ba45252a7cbcf746fd9f1f2b83691ae8a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLA950600331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ea516a850486eeb0a51361df5a2ff81db059c729d2ee6bd304d7bafc9f526b. 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/NLA950600333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb6a3f9c4dd6df1ca9ed84a0a61091cdd086637c6a5432072a0cad8967e0e96. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLA950600334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565008476f7b9117bfd9bdc7a2ac52e6fedeaf9c01a3d3823d768b71f635154f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLA950600329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e03a59e8b9058a50955531fbb51018d9e7b828d8f7ed6a4913ecfcc9a33ceb. 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/NLA950600332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75de8832cc076846e38a7420f2c47677323f96f31f3e327396f369ca18a5963c. 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/NLA950600330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ea516a850486eeb0a51361df5a2ff81db059c729d2ee6bd304d7bafc9f526b. 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/NLA950600333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545004284076d72068ad0f6bcc073b125b33e5865c5560d89a769d0a35be78ff. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NLA950600339.
Junior Songfestival - 5 Jaar Hits '03-'07
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ea8435d6cd56c6d98fffe0db159cfeec3b1d4ae68102fd1a5e844bd130c9ce. 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/NLA950300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ded419b394b7585627f59b361ba7f61d274bda5bdc066cd265df974db76d4f8. 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/NLA950300065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7677125f587455d138a22ff8897415a5c4501b6c561ec434499fbd4ba5c9f3. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/NLA950300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097e6ea7c10b4f392a11b23b06d353fe68c31e11093a9b7071db05505d06d241. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/NLA950300064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b46440b70dc5ed74abdc3cbf5515e25b886c684c05e7376ef622224c52a7d7. 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/NLA950400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5b97a87184fd8c845c25cde208b5ca0d4055fdadf43b2292a9951bbbb7e940. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/NLA950400061.
Hij Is Een Kei (winnaars Nederland Junior Eurovisie Songfestival 2004)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eefc5b15453d8f5683ddc0a1e891f250f670a87bba6134d5ce5de289cc6650e. 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/NLA950400065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135003a6396f5530ca2b074c1f498bbeffa85020e9868aa303334d38a48be045. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLA950400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd909ded679441e9c205fdd505d6f34ffc0079e12d2789bb6494e0c771fe7adc8. 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/NLA950500322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d9eb8e63ee89485051e99a2e794cf6adf686cfa7080fb65badb2f9220e684c. 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/NLA950500324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3244df56bd09fe9516cc038cd0f8fa76869e7bdf554b71d4862a09159d3f83d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLA950500323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e66c1528f56a74e5e255900186e5b213f1f200d483604d179e0bc68cc267bee. 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/NLA950500329.
Het Beste Van 10 Jaar Junior Songfestival
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091acf8c41730411ba7922095fd25772ca34e1f70b2d7063997f4e71be13239c. 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/NLA270700377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd80bd2608db87e24e35228b3a475d638be229f203cde646fa80e5b33226eb7d. 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/NLA950600335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237d21ade9e9e6c756221e71dd19b3cad1984d3d2dbb55cec743fbee61e8d985. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NLA950400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a64f0633c597fc7d91083bdd2914967fb2aae9c58f73b7497af3b522a52793e. 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/NLA950500330.