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 0xbbb24a413004f34cc21f5856403082c437eb0e8f5d158927f51730316e40ffe7. 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/89c79d0f-d2b7-4bb8-80ff-cfa6561cb296.json and https://artists.proofprofile.net/proofs/artist/89c79d0f-d2b7-4bb8-80ff-cfa6561cb296.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 0xf1b4bd9c7694ac5400224ee1a90e3d3971c63308300ae231bba3e3f52cd9deaf. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/NLY8X1801578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ea70ea6dedab7796d0cc6d067e164071dd083e450066e9b55d098875927cc5. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/NLY8X1801579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a3bd00140c5517dff84e423adbc96c0801fb3b3d782117fd63d278d2cc1a11. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/NLY8X1801580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010783d29152781cc21406940b176e4012333fc9593b32709a1a443e342596c7. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/NLY8X1801581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af3ca7c0eeebe9d7354e7fe6f11a4ab2e0e6cc5e4d962c4631f698fd4ec68a4. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/NLY8X1801582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b8acb4e9b705fbd48037073f791e5c968c5e209daa2b6218c2df5f43f14c57. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLY8X1801583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103e60e4598dfb4136e56aabecb845a27bd5a90102f7b90074381af49555c644. 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/NLY8X1801585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2e35b4deab02d1af6c433183386ae44affe5ff97590cf4408fe0d1c768c1c6. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/NLY8X1801588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d02be9bbb1240778dbafef8a8e1d7efbdd783dcc3717794750df97aa7572ab. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLY8X1800757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc81a3d15b5b65ddfe10fbc2afe9eaf26e9c304f9f1487b5d0fae63b78a88ddf. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/NLY8X1801396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1063ba15592dacc02a46836f0030ef49d2299ac81f2b3b8017962872293f08. 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/NLY8X1800371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaac4ee6885a51d7a6bd455828ede4f33537f2e270865737d6c21fca5c5c7031. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/NLY8X1800374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b80992164b2d8b7af3c0022bf0fa848a3a0478600146123a8cc9fc2d9d05c7. Chain 2 (Bitcoin): anchored in block 957558 (2026-07-11T11:36:38Z), 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/NLY8X1800377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0840abac2d60c308f94faa97f37ec814022fea4e16cc3e7ea77e1088dce2c987. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NLY8X1802385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65018fb5599830867d4f4ab6a07546ca9da34d1d7fe8c1b3573cf79a064cda8. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/NLY8X1802387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d93fa73bfc18501f3721db6b23236b09508561d5f9f637c0329517bde2f233. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLY8X1802388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b5eb6202ad11bbe11278341e8dd50696fbdb2af5fcb829a6d31ed2ea5ec6f1. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLY8X1802392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453afd4ab3aa911d1f44d90bfaa7c740362720d5aae946e336b808568a4733ca. 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/NLY8X1802393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c468e7918d7c30fcc0bcd5fb41bf4070c786cfda8896422129dc51198047228. 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/NLY8X1802397.
Muzikaal Bouquet, Vol. 6: God Heb Ik Lief
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e4757d635dbdcc367cafd797256786ea113d9e8070bc3c6fe167b393bd8ab8. 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/NLY8X1803017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d82236e525a849c61490f15d473941850bece59c73fd2e8ecf6b6eedbef3256. 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/NLY8X1803026.
Te Deum Classic Collection, Deel 2: Samen Te Dienen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190d8b649ab29c87b3c142ac301e004a36c65b2a48f045ca26ef9adb1a779a4e. 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/NLY8X1803194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296981ab978d70f6d9462f6b2184f44703640e27d88f65d0e3f90ce4a923791b. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NLY8X1803195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31bad7865f4791e9f0ab242885f934bd39a77cf0e447317dcf816587feeced8. 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/NLY8X1803196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f53138536dcbd240b4842e317384c0c46f2fe5885de6c706c4945dfb1d60e6. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLY8X1803197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf28f46ab544f7fef4b535cba70ae49416e822d0b611d301b081b16364193cf5. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLY8X1803198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c49499cf5031d0b7016c543d1792b7e3eb4dd1af04a3ed30f7b0929ff3947f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLY8X1803199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bfb781998730064cc4086fe90f0d012798fd11aa1009cda4d8c8910e8992bf. 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/NLY8X1803200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbc30ebf5307d5679f753a8206b8d11b88781050ee46c447505b3536bac351e. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/NLY8X1803201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2287cfd946788ae68336fdc241ce972133729c2884bb59b7b7cfacc250ad97c. 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/NLY8X1803202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9ebb7a1f5a6e1a44724602283620fee6bf24b4f6555b758013c7326fc75d44. 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/NLY8X1803203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b99a81ab53ae033280c2e3ffdbc1b3677a0e9b74e62fcf5aa4b05120809d6c. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/NLY8X1803204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d64bff7c11d4ca6a5ed8314e85e8c76877871d245066be3dcc3310412fe45a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NLY8X1803205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8d17b6b82647d07cae9b90ab90eacdc7e77913db826d2cad5d777bc1679b0d. 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/NLY8X1803206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409ebb73d59b3e5609b727d9ccd1c28efc4060bd840f2e05a06b2482e2c4da2c. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLY8X1803207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf7d0fcdf977b4690f04137bd057334c44d54baf29258ad0ca41d3fab27541b. 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/NLY8X1803208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38414e28af6f161e0a44d2b2f423e1ed3e63f10b6e40e362f0d787f9699d8c39. 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/NLY8X1802105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3af23ba2f2aed5efda1f965ea87bdbede2c14501cf9ae4466e171b1355c670f. 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/NLY8X1802110.
Hollandse Sterren - De Allermooiste Koren
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40339693dee5348e7ae4f8e02c308ff7cd47afa4270e7a427145afd30e7b5ef. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/NLE320800943.