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 0xd6c8fd4595883d18b458532592c2ef912ca5d3fd267d63590581462fe56bd938. 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/1f090fbd-d22b-4775-8541-9e9d73162ce8.json and https://artists.proofprofile.net/proofs/artist/1f090fbd-d22b-4775-8541-9e9d73162ce8.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 0x041c07df2ef76a298ea1dddc77a819e48e9829cdd3ed095dde2c3790ec91f08a. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NLB429901130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6cb85001087d6f466fdfc7148658e8919edcd4ed5b4dc4adc3428bdba9951c. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/NLB420502009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3063d5fe69b9f75ce3ee1e0e9b209961fdb2eefbbaf37da55811487df602b9aa. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NLB420820040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9deae350b56dd831af2fd06a679db7a2f4552480f23f056f581f6b8dc3faf747. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/NLB421002001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97b8aa500cc3423c93ec23f4426e8790ed68f16d5538eeb8113fe9415048393. 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/NLS8Y1700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb658ce46040cbba6d91772134800dcfe65ece9b8a9994fb706d160586e4e7aa. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLS8Y1700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d520e0f1d1e81085b1b623a3dad71975c818ea8573ef980b1d4c4b7f618062. 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/NLS8Y1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe042427b8c1c7111ec6f0e3db51baaa05da6354f7489e45810c7b1d28b0ac39d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLS8Y2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e91c2894c6609808b95865acfd0e6b7b4aa1c59c6cb65835d55407a6c93c9ae. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NLP972300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd8b8435e2afd9583bfd51fd4732be5fb6388bce995b36d2bcc05d39f1b4cb3. 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/NLB422502010.
De Supersonische Boem - Annie M.G. Schmidt En Harry Bannink in De 21e Eeuw
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffb7f36d23d76442e28e839ac6b569937d00bc64aeee1e91c3a812c2215a8cf. 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/NLB601300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14a49c1dcd9defa510ea22c006a350f9360d3bab66fd3feb0c6b11bd2e83151. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/NLAB80800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fda7f5246d484b711a0b3de48a451933c83045b041835909c12466ecc1be442. 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/NLAB80800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a08221ff45ba4c8bbc1986b6d733343a820e73f5ce2512e77fde13edabbbc1c. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/BEJ011000273.