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 0x662302b687996f69bb290bcba2921171d27417be7753b595017f7b5e8b71ab77. 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/8898a450-2d86-4499-b6a4-dfffa62d6ccc.json and https://artists.proofprofile.net/proofs/artist/8898a450-2d86-4499-b6a4-dfffa62d6ccc.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 0x1dceecba910523ff5089019c582cff27786e09c8b4b25bb0b9fbcda1384dfe0e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBKQU2267523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840f8a3e87769f73577e69163a7b71ef7cb70d8491e2f65abd112600237b2d9c. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/FRX872309141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398e4d07dfb344139efea96c55da8eb61a84e733a5608b7ddd02dd1ee329e8b1. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZS642212901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c9bd553163fe4a583add53c46ab4e39ce8e0362d907a7f92ab51cc37a8dde6. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZMHN2263473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8818f0dd75ec7fdd8aeef87c59c2d04a632a0b60d7f350dc00f55b86a09f6db3. 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/QZMHM2230369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f0f45067ff23955b07f6931158ec652711bb15268ea0a0cf511c25271f56fb3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZS652220932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4057696ade7f730d6ebe5b5b0e863812fa43347319fcfd16b4c943fbc3f9f9cb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GX89G2239450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dfffdec24076c2d3d22254dc5ef7ce00640f5ba202f5df551f63aaf5feafa6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS652257495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e86a3778bb73bcef3abcfc3dfcdc045f03419abbdef22810e1aaccf273e5dc. 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/QZN882230694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5e0a35196636b9f38ecdbf991fbc825adcfc246a1115b1af5e2acf87e3244b. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZS632265781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b12487c2dc8dd0a14176de902fbef99ddc22547f26a614f0d2b6899b573700. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAGD2204513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61524c787d0e4896795d13060c23f29d805f9f35b9c31118c31755dc40525991. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZS662284333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce4fc74e0ad494cad5bc91d44396d1811f17c2951b791a8998ed0219b26da15. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZQAY2264180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c6d2bc4fdb6ebfe73208271cab7361c5c3ef21ac61310596b022f34895dd51c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZKDK2287926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0deeffc7bbedc368f284030597cf981434e097f313a9c1f2b26e546d3c9917f. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QM42K2278528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ec2307e7e5fc482b3aaa78b4f578c5943adefb2a6abef99f2c77e057754b87. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GX38U2228160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcea86eec629c3ff5bd113f00cebb2c49e947c02b8ca1e8be31db0403cd2154. 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/QM42K2240209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539dce9051b9ba4b2a03daa89b60eef406063c85084fb394d9e689605f0277a9. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZKDK2239496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6314d8b18eed942fcfe1a16cf763dd30c16f8cd3b6139af95b3ad3030904fada. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS662176447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8649fcd22505564db0145f510982eecf45ca0e74c4108ecb272d7486a86119. 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/QZS652187975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9049fd08ba8bbd917f70e0044d1234d9f031c6879f12fbe2211441e5f6f8419. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GB2LD2110306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533b03336695a4a842767e49b7bef941c8b5767627f0bb5d06c037d813bcc8ac. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GX5MX2121376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd479f9ec31f5121e45916b521f8a34682acd02f6768386ec2ba04277be866a8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZSYP2141645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf352f24b98c6fb70db81b6c0107847d43cd54ce8da04ef1c25ce62d5412ea8c. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/GBSMU9977707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f0f45067ff23955b07f6931158ec652711bb15268ea0a0cf511c25271f56fb3. 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/QZS652220932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c9bd553163fe4a583add53c46ab4e39ce8e0362d907a7f92ab51cc37a8dde6. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZMHN2263473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b78d4bb2f5e09f561f0b4bf97c0b73fd1fa2a7014b0dcb762a819a483c6db5. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZS632275563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398e4d07dfb344139efea96c55da8eb61a84e733a5608b7ddd02dd1ee329e8b1. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZS642212901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6314d8b18eed942fcfe1a16cf763dd30c16f8cd3b6139af95b3ad3030904fada. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZS662176447.