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 0xea68cc964b647ed0fd69cd3c482c07f2c78c0660f80d010bdb45fc46d0c05b34. 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/1a0a858d-7468-49b6-9b90-9c3c39df3193.json and https://artists.proofprofile.net/proofs/artist/1a0a858d-7468-49b6-9b90-9c3c39df3193.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 0xd9ca7bdad1009fbb6b36aea4fb8871c777b4f00be26ce572ea6fc5391f4cdbea. 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/USHM81867149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927e5ba94051c7a576163cc44df32527e1e37a96f07ddc803c56bd448d86ca7a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USHM81867152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75445b0945f47b825563142940186e132e3371829f8f6a9747ec2d3c0c900ab9. 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/USHM81867157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc8c641aec93a4ef7acccf4b73a3f884b72c0441f51b56f05f2921bf7dbbe5c. 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/USHM81867159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10dcceedcb1e91af09c51240b56f14d77f99d6f5354295e753eaffeec2006330. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USHM81867138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7db7504500f331ce934b37ddbd0f6edde08eff1a335cf999283657b8a66384. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USHM81867139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fba2e683868de951608b605f48b0d0cf12c9198e7738923c3e7ae9049622807. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USHM81867141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd9ef790925ae6a9e5329fbc17df8f67b1142896487b3f90a546df13beedd72. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USHM81867144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68da388f46ea69fc3c5386c92fe6bf1ef5b677d6c9a42ff12f36e190386e3a51. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USHM81867128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e1504dc218ef917af86615c07904fe981a90bf9c4b40b2e4f08d1a221a7b54. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/USHM81867130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982fed4de8874b235d82abfb7a41889f41225fcd93301b9bfd8da5cc07307049. 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/USHM81867132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d72bc12980fb2a0cc697bcf9ec5d9b26311548fb7cfd68935908957f9c8ffc. 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/USHM81867133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129a169fb4d3fa3aac051cea8ac9c64dfc7d7f1ba962cfc3226edbb8c1a36749. 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/USHM81867135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41040ed4d475f959a98795d3eed137a2f8073aee3088fbd2a5ab6e6a66371d9. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/AR0T41900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee333bd95c9e6063859d55327566594c0ae3274ce827f4fc70976dd8b67a204. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/AR0T41900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf1c5302190fa0200336eea9272a22fc29876cc11bc25e539588381f9d3c6cd. 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/AR0T41900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe6607b1654f44a4d5d0e6d61506654d09671c0404eed9f45e6314ecf5b6378. 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/AROT41900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811c885f181ac48ff99fdfa35078d20d3d77d6a274f08bdf2ed58c0d3f46000a. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/AROT41900011.