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 0xdd1b4b894cc135ddb1dae79594999852e852792e0cf04e69ebae752b9fa66b4d. 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/f4b1d161-18af-47a9-b401-1d5311b727be.json and https://artists.proofprofile.net/proofs/artist/f4b1d161-18af-47a9-b401-1d5311b727be.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 0x9b10b80901d45c7905e0941ac1fd958e53645b012c24b7fe8c1037d0e8c91883. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/DELJ81890086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74c132fc910fb9f7062f2cdbaa189a0a0a1e13cf3fb27081b033d7e20d67535. 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/DELJ81890087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb333d7c4468b02c8f68043ad4228b98ccd28ff13c1a73601b4b7882e8e22192. 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/DELJ81890090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8033b284b9f8e1618616a7faac4da94219559323852cfa714394bfb60328b17d. 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/DELJ81890091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e42da29aafd0106482a8c76d68be94857c05ad713720e3ab30826df21c081c. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/DELJ81890092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925d49a4180b3bf7b7811f6539cd955b277e3273876ec298db4888d28c8c8296. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DELJ81890093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f428564e4ca2b9ff3528a541e71a14667b9828f71f4d87ac931e8c6d1d7c77. 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/ES04D2000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219da9b0fd1c2d65ab6300df2c01b01cac4857f9c0bb42320582a223b144cad0. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/ES04D2000041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b6abf5cb4bdd56096fe830275117737b15a491359e479aa5a7d7a0402e3469. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ES04D1900069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51cef44ec4c6260edfb1cbdee58445b7810889b56f4436a73fdcf5a04f9edd48. 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/ES04D2000043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3160730c24b1bdeb9f7fe75ef850ad9ff62b11b3f26aee3913319cb73160a7. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ES04D2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda42bca8d180bcc245421e3bcc901f7edd9caf8686f7f0ea90eb2b40fe9d6d76. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/ES04D2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a47c619f53b708779619bab0accea6eb7ab2db276c2f313bf87a2e7c884168. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ES04D2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d39300af232f49bbccdd55d742529eeb176a01e9adca9a282cafb07f0fa837. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/ES04D2400082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f443af7aa62e8ce122e0234e692f4d0821e6269e473695fe02d6ccfcfa21e4f. 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/ES04D2300071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743425509152ba6aed7c3df678d7e01c278a010cdc4fcd31924b64eac1d51618. 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/ES04D2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9daf00f860f96a849eea99ea58be38607afc7d07323243167295e7ad9e585e6. 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/ES04D2300072.