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 0xb2b341cc3ecddaf1a3c1c7ab2a50088551d814bc95389d55178020f243cc9189. 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/9203b0d3-aac5-4e18-81b2-c1501f12da8d.json and https://artists.proofprofile.net/proofs/artist/9203b0d3-aac5-4e18-81b2-c1501f12da8d.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 0x52db5db00c857d2b36b7b1781000fece8b1045cf6e17a9cc17c05491173090ab. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ772584231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96286d344c4b723c13e2e949c0f9ceacb3c9e219b9ffa4b00bf1f1c29cdb400e. 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/QZZ772584234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4627b109384c039bc37f2b1a9a4548594adff5f87efec94e93543ee33669ac13. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZZ772584254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680264bc3248eaae86a3fcc3992dbb24c2934b53a873033a3ca6ac38d3497c00. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZZ772584253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46eb92749179a435cdeebf09c9e0630650f8990c68c940bbaa6c002f9203cb64. 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/QZZ782530494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1444ea67d1e705bc9cad76f19dfc22d40ce3530f81f06083f175dae7267f47. 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/QZZ782534355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe161320a657b52ef65ab57614f040f1be8661b79884965dc7d858b8ee77eb783. 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/QZZ782594084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3984b84e3afda0dddb2ab1528585058346e3da940540bcff5faa967ddc7813c. 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/QZZ782596479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd846f5c6a8177b55b160b11ef8f45a14ca6572fb0fda1cd9f7cd7c89ecbe3b. 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/QZZ782596476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2326b7badf8c18974fb00d86a269890d85934272c7aa6039cc565e916be588. 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/QZZ782596478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e5e32056b06e25acdadc6984d2bdec7a3d7c0918c852e6936b31a70cf798db. 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/QZZ782596475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8c00bf8702502cca0785342df9bffb97182dfd2b296732f42471827f71f0e6. 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/QZZ7L2560843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfc57b4334f3110873adedf4a031d8085aac6cbf822aa452b17296115202e49. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZZ7L2560841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4addf54840480174455d30ed570f539b92e3f88bd46eac314693e9b0f31efb8c. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZZ7L2559305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547cbcd6149286ef59dc388b13eede4de8f97b4c1d1b2676340105e12219d869. 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/QZZ7L2560840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd056ca5ebd93c700c8997020275ec441cb1a4595249e6a2548157acff13f0595. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZZ7L2560851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4fb359518a9a2d94dc01556ffb190498000b6ba3bd79d1364734b897354dd5. 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/QZZ7L2560838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300eb6e8398bfa740092274cbe855fefaab6edffe87f67b595772ebee3213a81. 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/QZZ7M2509357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366d7cd102a4bd1c9a1258822813ac9f459244058b34f3828944f81df45821de. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZZ7M2509359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89b2d4bc17d3d0dfb4697cc2b8292724c35ac27d2d6e0085c0b6d76757fbc07. 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/QZZ7M2508069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677bd0896fbc8dd14f8fc19bcb74c204a4b25074f58351d028056fc4d06e7f96. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZZ7M2510473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6250c78c58fe584c18fb9ff467ac2066a67d2f6b92199407ef03b2de899e8420. 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/QZZ7Q2529892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89661ba37aeb40f0875305f8560847b4846432848e7ae53a44856fe73e9ae48. 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/QZZ7Q2529910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753212fe4008a02aed75017fd53ef64ae015a57e0ee611125835ddbe32dc10a8. 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/QZZ7Q2527973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c121c6c99876366ba9ec20430a4911aab1a699b2c47c9c21547b88803149bc. 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/QZZ7Q2529895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62a49299e6ea7dc9db62c50a6594049fafbe07712fabf493a3abd8a6221be16. 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/QZZ7Q2527983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3318af68965b29d7cf383afd2c48110c08937101f8956a0794b1d59bd357f7. 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/QZZ7Q2529913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf847a2562ab310090020d0ebe19c932d7a6a69f9e8dc175ceba8c0ba882fa0ac. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ7R2568278.