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 0xb831f5d6c4aa4a62a56c8d625130308583e2eb8e0a96440d1300ec5270bb68e3. 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/6af9f12e-fe12-4648-a3b2-d630413e16b1.json and https://artists.proofprofile.net/proofs/artist/6af9f12e-fe12-4648-a3b2-d630413e16b1.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 0x1b67f835f133c5a0627c40285d12e0090228e6c5ecb64fc16508232945c0e480. 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/TCACS1677130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a271cf7e90793988519a534fe1ccfe5115f1b8976ca8a6c09b2b6d1807a6b2. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/TCACS1677131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0d03a856c1a5d53533d4fc75579fab011cae0cacfaa0cc6415b6e92e424f3f. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/TCACS1677136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669d64f122da60cc2a90b4df9b7626c2daea72f5ec7261b95f427261db706f40. 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/TCACS1677138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1337a13ed0bf722b478f4018b544b61bab6b7f5fb4b1f250a042cdba1a9a0d2a. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/UKBR71900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c62baa93e731d038b3396eef0f1a121fcf434a55ff1b3b0d8abcb938bf6d2b. 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/UKBR71900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c508b977b171b22e32a32e45a403af2550e8021fb0896ba88281fcf624fbbd. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/UKBR71900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549ae89a70bd5a6777f876abc831134212cc5420b0a2d1b5e867de77b6a7f926. 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/UKBR71900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeecf4bbc518685c58039dac81bbaa8c5e2398b8b84a1686608e35b6b9a9cffc. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/UKBR71900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7aa61fdf3dd482d6bdd6b5acecadb63ea64b24af532b7081edf9c539463e03. 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/UKBR72000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4a5d4656b77fe43c0d6fbd46f1c16c2b076424fa5ef480e8030ed12c73b3b0. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/UKBR71900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b537dec19fe96ab51c9c328641f6168624b5e5ad1915d02511f5199d095b85d. 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/UKBR72200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa218490a87aff80fc6a94b7d973d27a6ba5290bcf9854e7ed33ef32eaa34d2b0. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/UKBR72200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafddb61675ddccf409d5c52c961529c31b43422219a7590b9f35c2fcbb295a6b. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/UKBR72200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ab33d52629cdb976ae6f16ebff01dc9190dccbed241c8a86496025c3ddc893. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/UKBR72200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be6abc561e1f71acbc36d75c36254a6dfcdae92ac2732e840886bdd159ba69f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/UKBR72200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5f1b695516fb878b2f049a8cd8bb22dcd70400c4232577cefa21d6363ee174. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/UKBR72300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad38526ade487c5fae3185681ef835700c62ecd9f0f3689f0f1ac3e7a5d99576. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/UKBR72300002.