thumb|Toni Holgersson 2015 Toni Holgersson (born in Stockholm, Sweden on 29 January 1966) is a Swedish singer and songwriter. Holgersson released full length self-titled CD Toni Holgersson in 1989 on
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 0xbb2d0478a483c0d1393f724d8e7ff7b2cb13f267930c922be87617f0e8621eef. 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/2fb00fb1-9aa2-462c-84a3-04a7ed53dfb7.json and https://artists.proofprofile.net/proofs/artist/2fb00fb1-9aa2-462c-84a3-04a7ed53dfb7.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 0x1d89fa09741ce43bff0302ad3e250c2f325eb62db09c4ed25194097c5fe9ecad. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SELAA8901502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0524f95c1322f7f78cdce88631c4020c3e1e98ee224b6f75094fa951ebdd1be. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/SELAA9100801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51d669fddddbb4eb087b0343b49045b9f8b678c71d0696d66ec938223f717a2. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/SELAA9100802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdac93c0caa642e2e1f58746a4961b3ecdca47d3e115779ca3fe86e5cbe4792. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/SEACA1000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95331859ac39f2118866de5957d8ae6ba0006f4dae1c70e41338aa11dd4e20ba. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:21:35Z), 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/SEACA1000106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x883d0ab16122739b37bd68c6eefbcdf65c51c75ff8b9aada8de2e26f268cb100. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/SEACA1000109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd0918a236a0d984487b5f890c303a933556563fac081199e1c7f3da5785aee. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:18:12Z), 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/SEVGT1201208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb80b678e32a6a8dca440810b9d1f68a24bdae8314cfa6f2d71474a529ca1ef. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:10:43Z), 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/SEVGT1201209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8e2dc9a46d743afa84515bdd95be4a527381a49965dae5fabebdc5ba7a0734. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/SEVGT1600701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939027113b528b7bab1cdcb4a222a87e49c60eff6994e1f96d8b28dca4a8019f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SE54P2000701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ad03dedec4239e82b12c2d5e42c1df656d4714f380497f5891dac5b666ea1a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAMA0500461.
Jag smakade på döden en dag - 2007 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ed47e4f6651aa92eb12724a8a38a96d55ef5b428da2b5b9d7e5fdc10270f1f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAMA0700914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c4d02f2dfd18bee2fbc0be0a827bb7742a3685f03937bb36faf7539eb4afe3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1601096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf443ff70030a8b587690abeb11bad2ea447ea73d8152fe7cf4a7e37c56a24e1b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1601109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6eb4886e0622841b76489e1f05fe17fe562c246cb392d23fd5dbf589a62359d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1601116.