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 0x44447cfae6009da4d0b8c671b84693c2960bbaa7a0845ec92f687d230b8d1521. 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/97d2580a-7cbb-4a4f-987a-3bf9ebd98ef0.json and https://artists.proofprofile.net/proofs/artist/97d2580a-7cbb-4a4f-987a-3bf9ebd98ef0.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 0xa7e9c91ebd209589d453dea2c182679ca4a9e1b6db9a19b6e75783c4522daad6. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZJRC2036900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc29a4c03358d206ab565fef36cedc65d34f0299e4972cc45ea1e6877d414f1. 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/QZFP52088017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3735964ca55517a221bcc04c8e8e3e2bea05ad29e3f3ed12f24dd72200090dcc. Chain 2 (Bitcoin): anchored in block 958143 (2026-07-15T10:15:04Z), 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/QZH5E2003694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff0d967545c941b8751eb92c0ad6b62f94b670da16c2c9cbe99c493f8f51b32. 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/QZFP52088020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20cf09014c535304076eb3f880cda049221fc4dc78c99c0488e8db32ea7a622. 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/QZNRS2026426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7512df345f07290ba37a2aff32ca68599221415f97ce3f6b7e1cfed877a9230. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZF8N2181387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c4181ca8e3577380b3e426df4753efefde226601611ee6ac370fb53ded540f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZH5E2101039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9a4c4e8bdf51fba2b9c0ed1068e2efa1615505bb5d9d89e31ede3bd0765964. 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/QZH5E2156683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cab49186ad3b83945779af5869101e4fb8351cf91c1578d875f038bdbfba73. 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/QZH5E2179675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d29803c9601725c397cbf132d0f6ad5c2f7c03fdae838f711544ba904184bb0. 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/QZNRS2019499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe679702e6dab59ada38d8534fc8f3be45249084e74b7c884442af82d6d49d15c. 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/QZJRC2129871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e069e572c6e8f64be38ce0da60f826067923b004cb6a88ffe9225579b0a7e35. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZT862198351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee2f29b4af99bccd14ad05c1deb6e8221e16502c53e84a8a9303856f38accbd. 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/QZH5E2239542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d499c803915e01239265fc17c358a63f14cefce9125879ca4e20f5eac1ac33b. 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/QZH5E2242491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8f8d7096db19b7795899defcb6985bd123005fe8a68ded512ebd6a706733bf. 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/QZH5E2239570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4962e667b6ca3a14ef7091ed60bee19df59ab61ebc1f72ab5dabe6bbeef209d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZJRC2228323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c204dfbb01427c0b3c47a5599955a7d1ce0bdc49df70edf4ed3126e1e8863ed. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZFP52379746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9291787764bc254c097864ae6ba983f19c08991a454ccd988978eb1a3554665f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZH5E2476776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf400a888da114bb58ee2a4b687708a1b67990195b53f1a88ac627f83a86851c5. 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/QZH5E2476781.