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 0x1dce25925d6f0e04348d4fa280b1caab1f0e9428e05db2075cb424d74316ce86. 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/e3078a2b-2f5b-445b-89d9-feb8bf90dd5c.json and https://artists.proofprofile.net/proofs/artist/e3078a2b-2f5b-445b-89d9-feb8bf90dd5c.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 0xb007a1a48b7d7fedbcf573144b31fe0d9017c06111aec8fd9193fd191a9c8525. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAFI2021046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec79a5479660ea9b49853b0db839b2041dfbc5a611e392d2f66e7eb1609722a9. 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/TCAFI2021050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fdadb205ec49e2b68753c41dce6afe1b47a6fd169216447620b663f26fcb8f1. 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/TCAFI2021055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a702ab9e34352e485a5f83549e0c3d0af21498027fa57b3413655018ed0396. 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/TCAFI2021057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fd7542b2e20726079377b2f3bcaf1fea95c8cb479e2f96798d855d9fa353d1. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAFI2021060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760ef120151a80967813f8eaaed0ca0ad7b476099fa07d0c420a44dfaa8912e1. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAFI2021062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10b8eef75ec317f0df70ef6eb116f0d3d2758a3858e0ba263d17319c5263829. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/TCAFJ2121032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20fb4687e5c2bf6ecfbb4c1996d034bb1ef4b9987c428e067917d24a8aa8921. 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/TCAFJ2121034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a50859a8dbe0f9ed4f213dbe8c549e30d93b92344574e502d30752bd0c8d628. 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/TCAFJ2121052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473faa98738c2e67f38b0a0624d9b03e09dd1146703e5e7eb38bb45c1e6f8bc6. 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/TCAFJ2121060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9e28908f98f3c22db3aa2ca8012f90b77b38f729977d8f03ef4b117cda1bd5. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAFJ2108405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4504885edabfbde05c61c9f242c175a84fc164b8450bc5617c965fba7c899c38. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAFJ2108450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6702b1d330e236093e5a22c7e1e6a83e91305d18c426af60222ad3cb7c000fed. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAFJ2108453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551efc31ec580ff9df764b1a488e2447ba72b10c19667e7aa161d5b0057f1e72. 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/TCAFJ2108456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91b4c33dc4b243a4b1caf056c121aff9d836e32c6628377d0bead725ea39644. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAFJ2108478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f8a3d144c1f63438dbb66e155ac6d68c78553070725a9305af5e516cb00081. 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/TCAFI2193442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2262a01274936260ecf45e375b6a17da5dd207e3b34609338d3802d915060313. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TCAFI2193446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287553caaa084b8196349f24ee869f9db6e29802077969bae82426dbc46ef1e3. 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/TCAFI2193448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35489bf74ad0e8120b706c012c7ff2b68456cdfaf7670ab0f9bcfbb50f0ef435. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/TCAFI2193456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d296348179c9c2bea89628c9856596b89308754305c6e122fdffa74a65422d. 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/TCAFI2193459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d6e45ba693721f6dde5e4220a41071d07ea94f30e6b10f455b0e83ac109200. 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/TCAFJ2108195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba50a87c24839027512b6f245c412f77dbb7d4c7e4c7045b8bb715fed3a34ee. 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/TCAFJ2108200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbbb39c1423df4fd0d82c6bddfd9212912657f06dcfac6e8ccd60b4719514ab. 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/TCAFJ2108203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94bacdd0aec6f2d520fd0df6bcd7557256dc1486da5f69a0981bdc212c3c979a. 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/TCAFJ2108206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e497c2e14d3f7c4f68cb424062ca0d93a8a3ae1cbce44098eb103a0c63c1bec. 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/TCAFJ2108209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47dec0d566e9948df8a548a72394c9af37599ce8553fa231ab656aabbed9001b. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/TCAFJ2108216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059918e9fd36e5ccf1297d1538f45cde659370d9cadf6c074e71af09cdc0adb7. 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/TCAFJ2121180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3c69b2da222e9544622d1d593116572b263e2e1ac4d289741d90baddab6fb0. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/TCAFJ2121184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5c327d6316e7fe53d699f59394f4bc2fc662543fc0256ce4ed6f41e1d5fb0c. 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/TCAFJ2121202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5d74414910d83b217d09dd6310599745bbda982944d0add89fe035e8b92f94. 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/TCAFJ2121205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c8c0326a4ffd6ddca1fb358a337bbf5137c5822f551765d9280b9e213c4040. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/TCAFJ2131303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9465c2a3a79c10a0c1a8fcbdedd341a082be48c22b489d812c5c818591f430. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/TCAFJ2131307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf36e964cf3e7e3f9c94faab8dc95604e280fd3084a7372775a9d83327fa75df. 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/TCAFJ2131308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cbb02bbb2be88e48580f35fbf1e26e2b879925ad2745b097621422c798394a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAFJ2131310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882e7f2df97b34736f4b88b872cb71ade9073080196590f28a1127646c689b40. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCAFJ2131315.