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 0x0ea3644531f4998fb387c6e1f9a48290a6c43527cc20c4a895b8c3fee85c9b10. 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/3a9b48b3-0b13-48d9-a82a-6d5a024b3104.json and https://artists.proofprofile.net/proofs/artist/3a9b48b3-0b13-48d9-a82a-6d5a024b3104.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 1
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 0x3c1a36b2faedc37bac6d45b4aef9489923b9bce42f820c2a5d26492920b268ce. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ42291404 — a six-check JSON result.
Five Little Penguins Sliding On The Snow
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4791a9f5a8e7e3bc50506f8d8a833a01b8718ad20e97eb3cc9358ebb68e3caab. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ42291406 — a six-check JSON result.
Soft And Relaxing Baby Lullaby Without Lyrics, Pt. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b81c3a3b898094dd8d9d432832779d46ac279763f2314040f491cc77929f37. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ42291424 — a six-check JSON result.
Soft And Relaxing Baby Lullaby Without Lyrics, Pt. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf46492dc75d9a413888a6d814ca3e0900ab4b9381a33ccf8316831f47847225. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ42291425 — a six-check JSON result.
Soft And Relaxing Baby Lullaby Without Lyrics, Pt. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41aadd491074dbc0f57026907016b14d2963b14bdc9926b390fd4849c395ce2. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ42291426 — a six-check JSON result.
Lea Marina Dečije Pesmice i Uspavanke za Bebe, Vol. 1
Leigha Marina Canciones Infantiles, Vol. 1
Leigha Marina Canciones Infantiles, Vol. 2
Lea Marina Dečije Pesmice i Uspavanke za Bebe, Vol. 2
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390f248fc4d0169ec0e374f2b78a3a8f3209babaee7685ca6b50997d796e4540. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAU2207513 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e661d99d0107876bbd4383484e91425859d6862dd0b01b163c643679ad0607. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAU2207516 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b669e3c03cb14d584239f751bd545d952ae008cda14785f62bd0b856222571a. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAU2207526 — a six-check JSON result.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd3fd8df4820002360762020eda531dfce6d3861224505efbbda78b60ff0c63. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA42359974 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5daef767173357b55990b807b868a7708e100f3add94532255ee589c9dc5027c. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA42359975 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8fd483ba5f939b89f6399f9e0981fc65b7c6932982da6f002b43ef024c7a4c5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA42359977 — a six-check JSON result.
Leigha Marina Canciones Infantiles, Vol. 3
Lea Marina Dečije Pesmice i Uspavanke za Bebe, Vol. 3
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599f0982fd0c9dc594fee944ea9f267bd8d19d903c5c9711c4ff86637664e2b0. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEP2302012 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de6bf6fb4773552c23a66cbad7a4198112fc68662279d533808fa4b2c0f67b5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEP2302014 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510f349101ae4a6a49054714fcefb62e37ebb3a3578194f2ea1faabac23a8380. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEP2302019 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8caf00fd52db22a6a5147ad6555ce031ab7689ef9f82c1a601aeffa500642ee4. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEP2302020 — a six-check JSON result.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45c7ac7ee1e83834592b89407aa737573083abf5a115a8d623667d627e06442. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBB2396031 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6426c7eebed74eab1b81f530184bfb5b913fa7b1568bef4d184d4c6b6eedd75a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBD2371798 — a six-check JSON result.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6426c7eebed74eab1b81f530184bfb5b913fa7b1568bef4d184d4c6b6eedd75a. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBD2371798 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2624e0941aeb01afc67af25b034d13b8a6b8ceafbabcd5a9d4e0fa9dbe657368. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ72467185 — a six-check JSON result.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 7
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ab3baf5911b61fc459fc2f435a1088c7835c86f78519246505e74a428e9056. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2433360 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6190764741cf33c3fee39a7a56f0be411a323b9c92589a623e8b84f3a2c1aaaa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2433361 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df269f85726b838c7da8e9d2cae14ad3fbe24a1d3045a88f18e3f4ca9a9de1d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2433362 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53aa3d7175ef61d70bd878f14a28138dd2f2ea86f2dd4a9c74f526e3e69367f6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2433363 — a six-check JSON result.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0066fc4b3684a261918341c04b6cb8e299b5a32367fc3b7fcb6ed283fb1df5b1. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAZ2442299 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f298b0b05a796821c9d233692611278722213c62900aee1fcd681b4975b084. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAZ2442304 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cfdfe5739f43b7dd5dc6bb51bf6248c70371aa8f63538578c67c499d9a5148. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAZ2442305 — a six-check JSON result.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b62c7375920ef79e5258c98cac2adc9fcff40fc36d0ae1eb55be890849d594. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFU2465813 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b5c92d08eeb179bfed64a65c10f0efb9c8892e38b1d1ad83de0e0f7886619b. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFU2465816 — a six-check JSON result.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 10
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374f6922b35102408eb719b0c92bf6868c52392fa607e7e3fb342b52c9e04f34. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ32561252 — a six-check JSON result.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 11
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0054e54d8e059fb57f7767e32fd9685ccb951d213724a1db6153c8c65985f9aa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6Q2561814 — a six-check JSON result.
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 12
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 13
Leigha Marina Nursery Rhymes and Kids Songs, Vol. 14