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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cc3499408cb92afed1ca4f948f3090ed39ed49620dfc1dce777faece85433f. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d35c03cd-74bb-482e-bbc2-be6a1f6515a0.json and https://artists.proofprofile.net/proofs/artist/d35c03cd-74bb-482e-bbc2-be6a1f6515a0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64580026b9cca443f9ae3d93fdaf833b595a34fcfd6f9948ae1662c7bfad1985. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/JPZ922109211.
String Quartet No. 9 in C Major, Op. 59 No. 3 "Rasumovsky": I. Introduzione (Andante con moto) - Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ffbdc36afcd8d31cc139716e82558cff24ffa2140675fcfefcc7c9a94dde83. 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/JPZ922109212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4444374b088f7dc89f6aeee9e282cdb63cef3f58c184217559201f1a77443c1. 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/JPZ922109213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825193d0797a0d0b6171c0e26a66b05d1ef7bdb322b808941c0905c8406843a3. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/JPZ922109210.
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 0xad999ae47055596b540c203cd928f0c971c51d1eb292a77ed441a5be3f3c369f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/JPZ922109214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f3fb1879373ee75961f75e2166b1716d2d2cad0eb36ffa71fa53902da5de3e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/JPZ922109215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeae0a7a0b67d8560b4f48fbf1eb1d993bb2e001ec6d4366b27afecee7116922. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/JPZ922109216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f73151855fb1ebbdd57c380905d197e91b724ee9ca5fc30ea7e11b7e2bb9fb. 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/JPZ922109217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f5b0936ebf783002cba3a2e5a358f2de3b26c6229ef1d2ffc6d3cf0e62b623. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/JPZ922109218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a522aec408e656e5421fd9b5f5298fbb2dbee898fba339230151672ba1804cb. 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/USCGJ1878854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ee1c28169f1db04d8d18fae04270bb2fe624e01fc8aa575bd4f7bb49120edc. 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/USCGJ1878857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eda6cbac0bcd390c2759d0e334055b8da9e207ca1612fc2c9e5d478eb105e92. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USCGJ1878858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f0a5cb9b50e668b3ae54c44dd21d3ce7b942b615f7cc9f2317f0be679d0b2d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USCGJ1878860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d023a54ca2a831a756fc23165731bd28e58596510836aa5024ad2556844d72e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USCGJ1878861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b1cd0543be3ff08f31418a1c70bfcc62a30246feac39b37435fe40b740f267. 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/USCGJ1878855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe78990716771fde6a037b4b1b6556d9332e0f9f4c55ca052c6de95e4f2bc32a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/USCGJ1878856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55e860a64740e1611327797fa007f30fda374e131901b1b629d96d5b4c87da7. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/USCGJ1878859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113096eaccbbd62acbcfc256b0da72d86b49b8e8f32b01eaa7a8feda9a645d49. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USCGJ1878862.