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 0x3f51e4b0ac726538d9aa287f8067fb42c7db4a055df629c7b3057f58d41c3bc2. 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/35286383-35e4-4a42-8ea0-23cf9ca54a6e.json and https://artists.proofprofile.net/proofs/artist/35286383-35e4-4a42-8ea0-23cf9ca54a6e.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 0xc5d82ccd6d1651856d19cbb2fa0b30ea509a7d2ab6f7a189f6a78d0bca810e44. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ42287374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744c5b1772f6d38be38a0bd40260baa3f6c1c52069e531b02333d64d2fcaf9f5. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/CH7812227641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1974cbc5a5f114b0a3db41a121c85e63890e687d44405fd6ac8991234e001c66. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/CH7812343911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3467caf3036cb2e004a2baee675671e5164e1065342302f029e32a086f55e4. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/CH7812346282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832afa0ff19ff016772661a9920c9739d94f3d35404bc28d042e73cbb982347f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CH7812348235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef81d5a6d2d930594ba7f48ead3b43d08050a72e64af297a09864ffbdcce0dc7. 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/CH7812348563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f0862ae089318901e6dec01ca434a76d33f64e0adf4c960358a3c882da5596. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/CH7812348564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424948745c317fd84d4bbb48dff40a96e572e711f204f3906db92b0b3a556760. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/CHUM72300179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d232c2320fefb16b6d1d425aeb2511417576fd0ac25544a269b87440cc1e85. 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/CHUM72400127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f57bbfee4e5a3e2eb819dee34c010ed934dcd83d90f5ac418c58a241335770. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CHUM72400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54775e2e0aaa70b50b5bfd353ab98a44b049836edb9eb9a3c26afa483365589. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/CHUM72400301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf7a77bb5e46846ecac5520e243f3744254a4bc23a233df45c3df908bddfd5a. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CH7812408903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b35ac8009b8a25ab317630ad1ad7d73a60c9fd275acf95be6a4d68ab76bbb63. 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/CHUM72400306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f57bbfee4e5a3e2eb819dee34c010ed934dcd83d90f5ac418c58a241335770. 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/CHUM72400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e2dad03c1a85a3428d1eaf56ea49b4bc040eee2d1fb702a8e20d1468b2d981. 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/CHUM72400307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0744a8cba10f3afeaba32ee885a1732e5eca841c87748d11dc2bf03abe75c3. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/CHUM72400310.
Lift U Up - Aus "Sing meinen Song, Vol. 6"
Sing Meinen Song - Das Schweizer Tauschkonzert, Vol. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e24fe976cd5b270684cb4e7788e39b6f72b64eebff141efd70a3e5fb3147617. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH0832500010.
It's Your Birthday (It's My Birthday) - Aus "Sing Meinen Song, Vol. 6"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe668d48b472731de635cc457b470d0039c2c30e5d383cdf49a5a295ac3e1f7e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CH0832500120.
Show You - Aus "Sing Meinen Song, Vol. 6"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7ad9993849e668d35b4c45bfabba5edb92e2e2377203f925a7f49e14ce1bff. 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/CH0832500140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e91beca97fec8e586e5590a33fcc1795ae3f9b314427851bff9f2565489706. 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/CH0832500220.
Back to You - Aus "Sing meinen Song, Vol. 6"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cea2547a20d68c74850dc21093c2db0dc8b5af06fd2adf58c5f30c21859e3ff. 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/CH0832500290.
Nagellack - Aus "Sing Meinen Song, Vol. 6"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3389308d623a8b167ec29dfbd1d3550f5a416cfd2693b47f26fc553c02682587. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/CH0832500380.
Nagellack - Duett Version, aus "Sing meinen Song, Vol. 6"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50f2ef507da512657de9e551125a0be6d369c2683a7d035881d42570addbe00. 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/CH0832500440.
Movies Not Moves - Duett Version, aus "Sing meinen Song, Vol. 6"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b68fd251e1e3d09dc9bed160cf7092f9efa95444034a95458f87ceb3dbcc2e. 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/CH0832500490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54775e2e0aaa70b50b5bfd353ab98a44b049836edb9eb9a3c26afa483365589. 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/CHUM72400301.