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 0xa5ab491c26bbae706b8727a2dde43f7cfb398772505a9f0455eb7d1751fca59f. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3fe1b2ef-2592-4f68-acb4-41da6ebec93d.json and https://artists.proofprofile.net/proofs/artist/3fe1b2ef-2592-4f68-acb4-41da6ebec93d.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 0xb39ce5131f18f2326063a0526af40953db724ef31f2f4eb5a499222fa5e83500. 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/SEVHR2300305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc9d12acb5c2d6683c8e2c1de2fc98f1fd7b72dd5d7bed0007d45df3f4221a5. 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/NOJVA0526001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791f4e3c22e6d615ba3dd5d2674fd0af4065a80072d6f4dac345c17991796f0c. 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/NOJVA0526002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ace6220fba7cd356fddc599c0fd91281a19e0ae2c621e7a6cc6981522bebbc. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/NOJVA0526003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e63d38bbec93a5503d1fefebd79b05c8a5e1febe52374dc52ce438b0f2c9bc2. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOJVA0526004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fcd920b44503e76e72511661ec0fcb1d230b4e5cac4c559d6507666be24cf1. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NOJVA0526005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10eaf7119a462ab822a2dd4884360a2ee78824d07238fb3c6995c9e29e0d0ee. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NOJVA0526006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f1310aa2fe17d17fe3bb40d84dd4b154801f9f0f59ba17cd34ec9566f5ad31. 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/NOJVA0526007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5194ffcca7afe6610eaf23ce22178750e7f172df2ab092c125cda3dfb1c3f4f. 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/NOJVA0526008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8312de7b77754793bae4d94590580c8c630b7f24c247eda5ac04cc7f32d25c23. 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/NOJVA0526010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b20dd8e873277c0a623e1a4bf97c5028257169fad15ad8eae2b1b82b332d52. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/NOJVA0526011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbe1546183e53f02673997287e35a7a692ec64100f045cb7bc4cd96d8f08fa5. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NOJVA0526013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7043134c05656dd84cd972a5cb7fdf0e04bd5cf6948471ba631487d398bc09. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NOJVA0526015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ab192ff14503a1112a0de375a9754af75eccb422903e7324671d19bd3f6d83. 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/NOJVA0526016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6a38329e5c93736f91d6f8b5faad2d5ec0c61ab62fd33e017239c3b663b110. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NOJVA0526017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3589e444410d4c4119b0a6551d4ff7f025a06a49f8a783240ff75257785d329. 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/SEBGE0700064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d9eb2c7bc0839c1a92862389208a2c688d833728c93299f2632fba77fd22fa. 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/SEBGE0700069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf2948c6a40218bb3e169aa917ca68fecb1fe072622f989e115978ac0e727b4. 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/SEBGE0700071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561eedb2ee42a0be7d3b56488650c6e1a44a8e36676d34cf8c9c68877cb10ef7. 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/SEBGE0700072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b40f58408570a3356c116047c1ab7cf54869f1ad56c1fb5aa7e5b74e23e143. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SEBGE0700079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c448c2ff77066be4ef0c4e7ea63c029454fb19c849df286568fd006374b9ac. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/SEBGE0700081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f323464bb6946551de07ee5971640cb6dcd4a78a894b958bf7232a9c6d2c66. 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/NOJVA0829603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcece1b59061140f9bb94991c0abae9bbc5446ab2e8faa2afc368c1f4c52ca24f. 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/NOJVA0829610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ad5160c7437d08597b7c97d51e5eafca0e420007cf41ae7cd3bed5c2259503. 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/SEAZE9411040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a53cf1d7a726de735c4395a1b6d4de58f8aaddf5654af8196cdb564e8e7bb0. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/SEAZE9411090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f31b38eb32ab4a263348f5edcc495a7e4ed46664352d794454b56ef777d2a4a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/SEUM70601321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda7a0b407360536a3b0318cc1a0d61ebee97a185d1fa819abb781b3636b7ccc. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SEUM70601325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1442ae8d5b45ca419ce72bfc76d851c8a43f43b11d1e3677852643103904751. 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/SEAZE9411010.
Svensk jazzhistoria vol. 7 (1952-1955) - The Golden Years
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a5b3854c6805891d62bec64f72310176aee2ebdd8cce3bcb34c54393bce340. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/SEAGA0017170.