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 0x3c342552eb800a21b9d862e10aa70a5f3044544943f4806fd60f63afb5dd0fa2. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b81da85a-1ebe-4ae1-87a7-e38cab448ba4.json and https://artists.proofprofile.net/proofs/artist/b81da85a-1ebe-4ae1-87a7-e38cab448ba4.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 0x143fcd29a2a8bf726d7eb74b317316e53a97fafb891a66aa09db1bcc7adc6016. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DED811722540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30e2327e71e395eaaa26a0911e16bb8a2e714cfb6ed52a845e0fecc455d509e. 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/DED811722580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3ccc595c3a92e646f22920d87896c7b2f14dd396dd4f21ed64cf6867b86a2f. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DED811722640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68afbdcd0c41cf8f51071645504f7767f3d88159b9d07b078e4607a53efa68f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DED811722650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59bfccdec5efa0acad8ebfcfac84ff4134cc4547848503fb5b7c804fe859a3c5. 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/DED811302410.
Marsch des Hessischen Kreis-Regiments und des Regiments Landgraf
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3179afb9e965efa6c782567db67c7e7f56c03a705ec7b7d92c9af1bdc32699aa. 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/DED811302420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c2aeff6d55eae3b5cbf20860630b716b785b1d0ecad416fdf38ccfd4349f25. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DED811302430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a45f8c6b4b3061e84121b4f5f006a368ca683849da670fd7a48a3784bc7015a. 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/DED811302450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aad0af88d184b10224db9dcaf3130ce502109196cd94c3e59ddd118c138b82d. 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/DED811302470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b93d638d389315410d451196fc775205b7a863653784ab22916c3c7a8640f51. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DED811302480.
Abba-Medley (Take a Chance on Me / Fernando / So Long / I Do, I Do, I Do, I Do, I Do / Honey Honey / I Have a Dream / Money, Money, Money / Waterloo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2728e45f678eaefdf831907d5cf554fb4378d92eb6c2e19de903009596fab21d. 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/DED811302490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d13d05361ce0b7e2ee1845f7dd6546720dd67eb67f59708bb12400e240d85a2. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DED811302510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cff60d671b23bf2d4e3d37b84959656736b5da80987b6e9ca8b84bfac5a188b. 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/DED819603010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31164b0cd4aef747691d9be89ee12e26c00a41ce0bc42a9592152f14929c8591. 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/DED819603020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6f693d3790e71241f3535c6b23f8e0362ce88e7d3a999e468fa6ac0b4b79d9. 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/DED819603040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd4911053e7e788b7344615d2d4c02af21fee527aeae47ad278abebe2b6f09a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DED819603090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf007e74206b2708a3f219c446c66060f05ba71641e815190f25c7b10a53ca2. 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/DED819603300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51c569a2d285fc2122fb460b7021958962468fb0241b4d51d0c69c891c5062b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DED819603310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4670e8bf7e6b8f3db7bb971cb44c2eae889b45c34dd08ca7c05b2fa62716918c. 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/DED819603330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8898d3d0a5c000a0b28d832528f5fd5dc6edb3bfab857c8f7d5563abf15fa9. 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/DED819603340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dace9c75119a24b143bc0259e2c51f17b6270594ab810ba6c188200bed57bc9. 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/DED819603350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a3d5275e3389341dc4088d2c2c32ec5b80336f9b603208d25fcca9a31a039c. 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/DED819603360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f75754d65f1532547e88ebe66ab88aca39840a401dfa97960995e3286543e7. 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/DED810001580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc43cb0b35e24de5657902a67f1c21203d4909365f646a8244df5049f915a3ae. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/DED819605960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317c40f1a628b93f1670efe8a5d3a71e795ed85a15cc6ae708ff7e8c879f6086. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DED819604110.
Robin-Hood - Filmmelodien (From "Robin Hood")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4118cbe1a6d213e7b98dc4736134127f1e76e0d60c23733e1eb4b44656b5f6. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/DED819604920.
Mission: Impossible / Claire / Trouble (From "Mission: Impossible")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bca0177e6ff98bbe6f93f4fad943599912d61ac4b8b3a2a2a0363c0a695b736. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DED819700010.