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 0xba8e21c45647543dcf237b6b5659bc1071eced7221930166216987932ebb779e. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c8af4e76-51cb-44b9-bf04-faa1af384f20.json and https://artists.proofprofile.net/proofs/artist/c8af4e76-51cb-44b9-bf04-faa1af384f20.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 0x41cf157d0caca0333730911a340aaee0419425effd323b2bc526f30f8bb208b6. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEB338428001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34634bed980eb1286bb09339be3a240e52f6cb49bda431c9b78bf47acecf0324. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEB338428002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68779af585e27a0ebb925543b02dfd41a0857c76bd274448157b35f767d2b1e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEB338428004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368477fe702934e9165375945c9a3b152508e86844ff237c480345b116010c18. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB338428005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2837fceaee96468c3a4fef0b21902d1dafb643683df280ceb34a3e511875ca94. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEB338428006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02e35a62696677094d992dc6f54189ef3b40f38f7b451cd50629716b320301c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEB338018901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d261f60f1e6b535caacc7236a0761d4911bb526cea618bdfbcb8a0f0238c8c9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB337507301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28dba66fe28fbaf6fc5ab670a18abba847680e942a9564c9b22c3512185d30f5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB337811402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f023d4813796b6a3d6a3ff2945518da26ddb69e7f4979c9f9b4423831076dd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB337813101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb317377b7580db7e7bbf9570177b4764cd83f28e28d9e72c4154299c1282598. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB337915502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b8dddd1bbae59ca4bbd569489a4a59ff113ac63d643fd6aeb806d42f179680. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB338018103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59dad84bf92b2e7d74a091b70016122d4138a2240ddc2fa8a2d8b2cbe5db13e6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB338019004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35fe94a204e2985dc7bfc52bac2656f85f64dc32e1e96dcc07d76019ff2d7bd5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB338225201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0d8b238a8446877fd9169202a5a016050d4425a669ad121e0a57912db1e1ce. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB338427803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca50af4d228a1de14380c4c63b5db17a4aa2a4cf20b3f0201f6eebe5e5a0ac89. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEB338327101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bc93739c4419ef042b0590f592d38133b8198a9817a4972964c5f3d552e747. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB337915201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f63f03c95a201936fd41aaefccb0367eca0a7ab24579b80c3fcac6c3859c2c9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB337915204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe886156c18a5d91f11922dd5bf4c9cbfdfeaf830de5160b79baca0ccce85c78f. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/DEB337812801.